Jbm ballistic

General Trajectory Calculators Trajectory Calculates the trajectory from bullet BC and firearm info. Inputs include muzzle velocity, sight heights, chronograph distance, ballistic coefficient, drag function, line of sight and cant angles and atmospheric conditions.

Jbm ballistic. All of the JBM trajectory calculators allow the user to select the drop, windage and lead (if applicable) units. Drop units are either a length such as inches or centimeters or an angle such as milliradians (mils), inches/100 yards, cm/100 meters, etc. The length is a user input value.

The ballistic coefficient is represents the ratio of the drag of the standard (e.g. G1 standard bullet) bullet to that of the bullet you are shooting. A ballistic coefficient of 0.100 means that your bullet has 10 times the drag of the standard bullet. Bullet Length The length of …

The case of ballistic trajectories with nonlinear drag is just a boundary value problem for a nonlinear ordinary differential equation. Using numerical integration one can use multiple integration processes to approximate the change in final conditions with respect to changes in the initial conditions. ... JBM Ballistics has a download page ...The drag function to use to calculate the ballistic coefficients. Most commercial bullets use the G1, but for some long range bullets, the G7 or G8 is typically a better choice. Some military bullets fit the G5 and G6 functions better than the G1.JBM Ballistic: Standard Edition. Filed in iPhone Apps. Ballistic is the definitive ballistics trajectory calculator for the iPhone. Ballistic calculates trajectory, windage, velocity, energy, and bullet flight time for any valid range, and can compensate for atmospheric conditions such as temperature, barometric pressure, humidity, and altitude ... With a vast library of nearly 5,000 projectiles and factory loads, rangefinder, range log, and head-up display, Ballistic is a complete mobile companion for hunting or at the range. Ballistic's world renowned JBM ballistics engine delivers the gold standard in calculations that other applications compare themselves to. iPad-Specific Features: Power Factor Input Data Bullet Weight Weight of the bullet. Caliber Diameter of the bullet Muzzle Velocity The velocity of the bullet as either (1) measured at some distance from the muzzle (see applicable rule book for measuring methods)I have a question concerning data input on the JBM site. In their section for trajectory cards they ask to input the altitude. I'm assuming they are asking for the density altitude, but they don't really say. Anyone know for sure? Are they asking for the density altitude or just regular...If checked, the windage is changed to make the bullet cross the line of sight at the zero range -- zero windage at the zero range. Wind Angle. The angle of the wind relative to downrange (0 degrees), 90 degrees is to the shooter's right, 180 is a head wind, and 270 degrees is to the shooter's left. Wind Speed 1, 2 or 3.

The Ballistic: Advanced Edition app operates using the JBM ballistics engine and has a library of almost 5,000 different commercial and military projectiles and factory loads from leading manufacturers. The app can calculate for atmospheric conditions, Coriolis effect and gyroscopic spin and provides ballistic charts in which the user can ...Geoballistics BallisticsARC was the most popular ballistic phone app used by this group of elite shooters, representing 33% of the shooters using phone apps. Geoballistics BallisticsARC is a free app available for iOS and Android devices, and the free version features a bullet library with 2500+ bullets, functionality for truing muzzle velocity, and support for weather hardware integration to ...External ballistics or exterior ballistics is the part of ballistics that deals with the behavior of a projectile in flight. The projectile may be powered or un-powered, guided or unguided, spin or fin stabilized, flying through an atmosphere or in the vacuum of space, but most certainly flying under the influence of a gravitational field ...Ballistic coefficient facts. In ballistics, the ballistic coefficient (BC) of a bullet is a measure of its ability to overcome air resistance in flight. A high BC means the object will slow down less. It will have more of its speed left when it reaches the target. BC depends on mass, diameter, and drag coefficient. Ballistic coefficient has units of lb/in² or kg/m².The JBM IDPA classifier application is a simple application for IDPA classifier practice. It allows the user to enter classifier times and points down and calculates the current classification. It includes the abbreviated classifer, the standard classifier and the pistol caliber carbine classifier. Data EntryGoogle JBM Ballistics. I tried to get their link up just now, but being on The Forum interfered some how. ... JBM is right on the money if you know your velocity, bullet weight, scope height, etc. It is so, "on the money" it almost makes shooting boring. "You sleep safe in your beds because rough men stand ready in the night to visit violence ...

JBM BallisticsBallistic Coefficient .425 C.O.A.L 3.320" 265-grain LRX BT Sectional Density .331 Ballistic Coefficient .575 C.O.A.L 3.340" Maximum Loads Should Be Used With Caution - Always Start With Minimum Loads. *Most Accurate Load C Compressed Load 4 Suggested Bullet Use 250-grain LRX BT Sectional Density .313 Ballistic Coefficient .602 C.O.A.L 3.330"Trajectory μCard - Constant Drop. Calculate a trajectory card from bullet, velocity, firearm and atmospheric parameters. Density is calculated using input density altitudes. Muzzle velocity is found by using linear interpolation between two velocities measured as a fuction of temperature. Explanation of terms.From accurate trajectory calculations to drop and wind drift compensations, these apps have you covered. With a variety of features that include range and elevation calculations, weather conditions, and more, you'll be able to make the most out of your JBM Ballistics Calculator. Read on to discover which app is the best for your needs.This calculator will produce a ballistic trajectory chart that shows the bullet drop, bullet energy, windage, and velocity. It will a produce a line graph showing the bullet drop and flight path of the bullet. By adding trajectories to the panel on the right you may produce charts and graphs that show the different trajectories side by side.A drag function (or G function) provides the forces on a standard bullet for which the drag function was derived. A bullet's ballistic coefficient then relates the drag on any bullet to that of the standard bullet. The velocity of the bullet at the beginning of the measured distance. The barometric pressure.

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Ballistic charts for hunting rifles detail the velocity, trajectory, bullet weight and other specifications for the caliber and model of each hunting rifle. Use a ballistic charts ...In this video we will be going over how to calculate a firing solution for long range shooting using JBM ballistics. The targets engaged in the introduction ...It's also much more. With a vast library of nearly 5,000 projectiles and factory loads, rangefinder, range log, and head-up display, Ballistic is a complete mobile companion for hunting or at the range. Ballistic's world renowned JBM ballistics engine delivers the gold standard in calculations that other applications compare themselves to.There is anecdotal evidence that (1) plastic-tip or hollow-base bullets may have larger errors, and (2) the velocity correction above 3600 ft/sec may predict faster twists than needed. Improvement must await new twist-stability factor data. Don Miller 2862 Waverly Way Livermore, CA 94551 [email protected].

The twist rate (inches per turn) of the barrel. This value is used to calculate stability. It should not be confused with the required twist calculated by Bullet Drag. The diameter of the base of the bullet. For boattails, this is smaller than the caliber. The length of the boattail from the rear of the bearing surface to the base of the bullet.Calculate a ballistic coefficient from near velocity, far velocity and distance between velocity measurement points. Ballistic coefficient is calculated for input drag function. Explanation of termsJBM Ballistics. This is the new home of JBM's online ballistics resources. Much of this will look familiar to you -- just use the links to the left to find what you're looking for. Ballistics calculations and formulas for small arms.Ballistic's world renowned JBM ballistics engine delivers the gold standard in calculations that other applications compare themselves to. This is the STANDARD Edition. The ADVANCED Edition also includes: - iPhone internal barometer supported. - An advanced head-up display for mounted operation. - Advanced wind kit configurable for up to 8 wind ...Bullet Weight. The weight of the bullet. Charge Weight. Weight of the powder charge. Firearm Weight. Weight of the firearm. Muzzle Velocity. The velocity of the bullet as either (1) measured at some distance from the muzzle or (2) as estimated from reloading data.The BASIC programs were given to me by the late Robert L. McCoy and posted here with his knowledge. He worked at the US Army's Ballistics Research Lab for many years, where he wrote these programs as part of his work. I have made some changes to these programs (with Bob's knowledge) only as necessary to fix bugs.Bullets % Percentage 1 Hornady, ELD-X (Extremely Low Drag - eXpanding), 0.264 cal, 143.0 gn 2.0 2 Sierra, HPBT MatchKing™, 0.308 cal, 175.0 gnBallistic’s world renowned JBM ballistics engine delivers the gold standard in calculations that other applications compare themselves to. The FTE version of Ballistic includes all of the great features you’ll find in the standard edition of the software, plus an advanced head-up display for mounted operation. The HUD provides real-time ...BC is ballistic coefficient and really describes how well your bullet flies through the air- the closer to 1 the more cleanly the bullet cuts the air. If you look in your reloading manual the particular bullet BC's should be listed. If you don't have a reloading manual to reference you can check out the sierra website:

The angle of the tilt of the firearm to the right or left from vertical. Positive angles are to the right. Distance to Chronograph. The distance from the muzzle of the firearm to the chronograph used for muzzle velocity measurements. If the muzzle velocity is estimated, enter 0.0 for this value -- no correction.

It's also much more. With a vast library of nearly 5,000 projectiles and factory loads, rangefinder, range log, and head-up display, Ballistic is a complete mobile companion for hunting or at the range. Ballistic's world renowned JBM ballistics engine delivers the gold standard in calculations that other applications compare themselves to.Trajectory μCard - Constant Drop. Calculate a trajectory card from bullet, velocity, firearm and atmospheric parameters. Density is calculated using input density altitudes. Muzzle velocity is found by using linear interpolation between two velocities measured as a fuction of temperature. Explanation of terms.It's also much more. With a vast library of nearly 5,000 projectiles and factory loads, rangefinder, range log, and head-up display, Ballistic is a complete mobile companion for hunting or at the range. Ballistic's world renowned JBM ballistics engine delivers the gold standard in calculations that other applications compare themselves to.Sniper's Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. Founded by Frank Galli in 2000, Sniper's Hide has been offering informational videos, podcasts, and other support to its users in one location. Forum Statistics. Threads. 473,151.Custom projectile/cartridge models. Mods I recommend to improve ballistic weaponry. JSRS Sound Mod 2.0 for Fallout New Vegas by MesserAR - Adds excellent gun sounds from the JSRS Arma mod to vanilla and modded weapons. Bullet Snap Redux - Espless by LowbeeBob - Exchanges the underwhelming vanilla impact sounds with crisp bullet ...Ballistics calculations and formulas for small arms. Trajectory (Simplified) Calculate a trajectory from bullet, velocity, firearm and atmospheric parameters.But it would not be able to hit the US mainland or the bigger islands of Hawaii. For years, North Korea has been doggedly working toward fielding an intercontinental ballistic miss...Ballistic Coefficient The calculated ballistic coefficient for the selected drag function. Atmospheric Density The calculated density of the air. Speed of Sound The calculated speed of sound. Time The calculated time of flight of the bullet over the entered distance.

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Ballistics calculations and formulas for small arms. Stability. Calculate a stability factor for a bullet using the Miller stability formula.Very entertaining read. I re-ran your calculations on both shooterscalculator AND JBM Ballistics. I used 200 gr, .400 diameter, and a G1 BC of 0.199 per Underwood Ammo on their 200gr loading. Interestingly, I couldn't replicate your trajectory until I raised the muzzle velocity to 3200 fps. Just FYI. I still carry my Glock 40 in black bear woods.BC is ballistic coefficient and really describes how well your bullet flies through the air- the closer to 1 the more cleanly the bullet cuts the air. If you look in your reloading manual the particular bullet BC's should be listed. If you don't have a reloading manual to reference you can check out the sierra website:You can, but not very accurately. If you look at the bullet drop for two bullets, one with a BC of 0.5 and the other with a BC of 0.55, you'll find that the bullet drops at 300 yards with a muzzle velocity of 3000 f/s and a 100 yard zero, are -10.9" and -10.7" respectively. So if you can shoot groups less than 0.2" at 300 yards, have at it.Calculate a ballistic coefficient from initial velocity, time of flight and distance. Calculuated ballistic coefficient is displayed for selected drag function. Explanation of termsThe JBM Ballistics projectile library is extensive, so its almost certain the bullet you’re using will be included in the options. To save time and keep things simple, I recommend sticking with using that menu. Once you’ve selected a bullet from the JBM Ballistics library, you won’t need to input the entries “ballistic coefficient ...The ballistic coefficient is represents the ratio of the drag of the standard (e.g. G1 standard bullet) bullet to that of the bullet you are shooting. A ballistic coefficient of 0.100 means that your bullet has 10 times the drag of the standard bullet. Bullet Length The length of …All of the JBM trajectory calculators allow the user to select the drop, windage and lead (if applicable) units. Drop units are either a length such as inches or centimeters or an angle such as milliradians (mils), inches/100 yards, cm/100 meters, etc. The length is a user input value.The Ballistic: Advanced Edition app operates using the JBM ballistics engine and has a library of almost 5,000 different commercial and military projectiles and factory loads from leading manufacturers. The app can calculate for atmospheric conditions, Coriolis effect and gyroscopic spin and provides ballistic charts in which the user can ...Ballistic coefficient (BC) is a fudge factor that rates how efficiently a bullet flies. ... This information is a pain to find, but thankfully, the folks at JBM Ballistics have compiled lots of ... The ballistic coefficient is represents the ratio of the drag of the standard (e.g. G1 standard bullet) bullet to that of the bullet you are shooting. A ballistic coefficient of 0.100 means that your bullet has 10 times the drag of the standard bullet. Bullet Length The length of the bullet. JBM ballistics is a good online resource JBM - Calculations The top Trajectory calculator is easy to use and the Trajectory Simplified further down even easier . You will need to know exactly what bullet you have and find it in the drop down data base and the velocity . ….

The Ballistic: Advanced Edition app operates using the JBM ballistics engine and has a library of almost 5,000 different commercial and military projectiles and factory loads from leading manufacturers. The app can calculate for atmospheric conditions, Coriolis effect and gyroscopic spin and provides ballistic charts in which the user can ... Ballistic calculator. Strelok is a ballistic trajectory calculator.Small, handy and accurate. Field-proven accuracy since 2001. Supports imperial (yards, feet, inches, etc) and metric units. MIL and MRAD - this is the same! Input all parameters, push... Lapua Ballistics. Lapua Ballistics is the ultimate 6DOF ballistics tool for mobile devices. BC is the Ballistic Coefficient, a rather important number in the world of bullet flight efficiency. A higher BC means a bullet will retain velocity better - have less negative acceleration, less drag from the air resistance - in similar conditions to a low BC bullet. A low BC means a bullet is going to start slowing down quickly, losing energy ...Ballistic Coefficient (Velocity) Calculate a ballistic coefficient from near velocity, far velocity and distance between velocity measurement points. Ballistic coefficient is calculated for input drag function. Explanation of terms. Near Velocity (500.0 to 4800.0 ft/s) [3000.0] [?] ft/s m/s. Far Velocity (500.0 to 4800.0 ft/s) [2900.0] [?]On AccurateShooter.com's Ballistics Page, you'll find the excellent JBM Ballistics program. This not only calculates bullet trajectory with great precision, but will also output clicks so you can create your own "come-up" chart to keep with your rifle. In addition, you can download FREE versions of Pejsa and Point Blank ballistics ...Ballistics calculations and formulas for small arms. Bullet Lengths I am in the process of adding bullet lengths to the library so that the drift can be easily calculated.Ballistics calculations and formulas for small arms. Drag Function Array Conversion. Convert multiple ballistic coefficients and find the best new drag function.This means that it is the ratio of the drag function and ballistic coefficient that model the drag of the bullet. For different drag functions, the Cs will be different, but with properly chosen Cs and drag functions, the same trajectory will be calculated because the drag force is the same. Jbm ballistic, Integrating this equation is much easier when trajectory parameters are required as a function of range. [This vector equation for velocity is derived in the discussion of CD and KD] But, it does introduce another differential equation for time. Simultaneous Equations of First Order, Published BC is .234. I saw on JBM that they had a BC calculator so used the near/far one to see how close the labradar derived BC was to the published. For 5 shots I looked at a few data points from each with separations from 20 yds to 60yds, and they all came up with a BC of between .179 and .183. Where I hunt I can shoot out to 800 yds easy ..., k 4 = h F ( x n + h, y n + k 3 ) The equations of motion for a bullet in flight, are simultaneous coupled differential equations. Specifically three equations for acceleration, position and spin. These equations may have been transformed using the substitution: d u /dt = d u /dy dy/dt = d u /dy u y., The ballistic coefficient is represents the ratio of the drag of the standard (e.g. G1 standard bullet) bullet to that of the bullet you are shooting. A ballistic coefficient of 0.100 means that your bullet has 10 times the drag of the standard bullet. Bullet Library, The angle of the tilt of the firearm to the right or left from vertical. Positive angles are to the right. Distance to Chronograph. The distance from the muzzle of the firearm to the chronograph used for muzzle velocity measurements. If the muzzle velocity is estimated, enter 0.0 for this value -- no correction., Ballistics calculations and formulas for small arms. Additionally, the calculated elevation is 6.10 MOA. This calculated value is shown above the trajectory table in the output of the calculation., Shot the 300 BO the other day as I am dedicating this rifle to subsonic only. Took a 25 yard zero start, shot 10 rounds (5 at target 4 and 5 at target 5). Great targets. Moved to 50 yards (added 1 moa right to scope but nothing on elevation) and shot 5 shots at 50 yards (target 3)., The ballistic coefficient is represents the ratio of the drag of the standard (e.g. G1 standard bullet) bullet to that of the bullet you are shooting. A ballistic coefficient of 0.100 means that your bullet has 10 times the drag of the standard bullet. Barrel Twist The twist length of the barrel. Twist Direction, Trajectory μCard. Calculate a trajectory card from bullet, velocity, firearm and atmospheric parameters. Density is calculated using input density altitudes. Muzzle velocity is found by using linear interpolation between two velocities measured as a fuction of temperature. Explanation of terms., Ballistic Tip™ Spitzer 2.2 9 V-Max™ 1.9 10 Match Hunting VLD 1.8 11 A-Tip™ Match 1.7 12 Accubond Long Range Spitzer (G7) 1.5 13 Tipped Triple-Shock™ X Boattail 1.4 14 Long Range Hybrid Target 1.4 15 Long Range X Boattail 1.3 16 Accubond™ Spitzer 1.3 17 EOL Elite Hunter 1.1 18 Tipped MatchKing™ 1.0 19 Scenar 1.0 20 CX™ 1.0 #, Since w x is constant, one can readily perform the integrals (assuming constant k) . u x = w x [ 1 - u y /u x0] . Integrate one more time with respect to t on the interval [0,t] x = ∫ u x dt [0,t] = w x [ t - R/u x0] . where R = ∫ u y dt [0,t] . and x is the deflection, u x0 is the muzzle velocity (initial velocity in the y direction), R is the range, t is the time of flight to that range ..., Ballistic Coefficient (Time) Calculate a ballistic coefficient from initial velocity, time of flight and distance. Calculuated ballistic coefficient is displayed for selected drag function. Explanation of terms. Near Velocity (500.0 to 4800.0 ft/s) [3000.0] [?], The G7 Ballistic coefficient does a better job of predicting the trajectory of modern long ogive, boat tail bullets to longer ranges than the G1 standard, however, it is still not modeling the exact Cd value or shape and will result in errors. Utilizing the popular and well-designed JBM ballistics code, Error! Reference source not found.. shows ..., Many free online ballistic calculators and smartphone apps allow users to select G1 or G7 BCs to figure drop and wind drift of their bullet. Berger Bullets' calculator permits selecting G1 or G7-based BCs. Those at Gundata.org and JBM Ballistics go even further in allowing selection of G1, G2, G5, G6, G7 and G8 standard projectiles., The drag function to use to calculate the ballistic coefficients. Most commercial bullets use the G1, but for some long range bullets, the G7 or G8 is typically a better choice. Some military bullets fit the G5 and G6 functions better than the G1., 16" bbl sighted in w/55gr M193 @100yds, appx 2" low at 50yds (Tavor X95, just about 4" optic height over bore). Tried a few rds of Hornady Frontier 75gr 5.56 @50yds and POI was appx 2" higher than M193. This got me to thinking I'd like a chart showing the 55gr vs 75gr trajectory difference from a 16" bbl that's sighted in for 55gr., K D and C D. In terms of the newer ballistic nomenclature, C D, we may rewrite K D as. C D = 8/π K D. so that the the equation for G is. G (m) = π/8 C D (m) p 0 | v |. The acceleration of the bullet, due to drag, in terms of C D is. aD = -p π/8 C D (m)/C | v | v. NOTE: that in the preceding equation, the C D is that of the "standard" bullet ... , Custom projectile/cartridge models. Mods I recommend to improve ballistic weaponry. JSRS Sound Mod 2.0 for Fallout New Vegas by MesserAR - Adds excellent gun sounds from the JSRS Arma mod to vanilla and modded weapons. Bullet Snap Redux - Espless by LowbeeBob - Exchanges the underwhelming vanilla impact sounds with crisp bullet ..., JBM ballistics calculators. Best around as long as you know your info. Most people screw up some part of the info or don't account for direction they are shooting. I am always within a minute of value cold bore with JBM's charts. To Crush your enemys, See them driven before you, and hear the lamentation of there women. ..., 6mmBR.com is the best guide for 6mm BR Benchrest precision shooting, complete with 6BR FAQ, Reloading Data, Shooter Message Boards, Reader Polls, and Photo Gallery. Match event calendar and rifle competition accuracy training tips. Equipment reviews (.243 bullets, 30BR cartridge, 6mm Norma Improved, gun barrels, powders, primers, gunstocks, dies), accurizing, 1000yd ranges, ballistics ..., Ballistics Calculator. Bullet Library. Select a bullet from the list or enter in the properties below. Bullet Properties. Diameter. inches. Weight. grains. BC., Today we're going to take a look at how to use a ballistics calculator to determine your initial cam setting for the M1000 PRO and the M1200 XLR ART scopes. So, we're using JBM ballistics - a free ballistic calculator online. [To access the ballistic calculator, you can click on ballistics on the left side bar, and then click on the first link, trajectory, under general trajectory calculators], Ballistic Tip™ Spitzer 2.2 9 V-Max™ 1.9 10 Match Hunting VLD 1.8 11 A-Tip™ Match 1.7 12 Accubond Long Range Spitzer (G7) 1.5 13 Tipped Triple-Shock™ X Boattail 1.4 14 Long Range Hybrid Target 1.4 15 Long Range X Boattail 1.3 16 Accubond™ Spitzer 1.3 17 EOL Elite Hunter 1.1 18 Tipped MatchKing™ 1.0 19 Scenar 1.0 20 CX™ 1.0 # , Applied Ballistics' mission is to be a complete and unbiased source of external ballistics information for long range shooters. We're highly active in R&D, constantly testing new claims, products and ideas for potential merit and dispensing with the marketing hype which can make it so difficult for shooters to master the challenging discipline of long range shooting., Ballistic Tip™ Spitzer 2.2 9 V-Max™ 1.9 10 Match Hunting VLD 1.8 11 A-Tip™ Match 1.7 12 Accubond Long Range Spitzer (G7) 1.5 13 Tipped Triple-Shock™ X Boattail 1.4 14 Long Range Hybrid Target 1.4 15 Long Range X Boattail 1.3 16 Accubond™ Spitzer 1.3 17 EOL Elite Hunter 1.1 18 Tipped MatchKing™ 1.0 19 Scenar 1.0 20 CX™ 1.0 # , Ballistics calculations and formulas for small arms. Drag Function Conversion. Convert a ballistic coefficient from one drag function to another. , K D and C D. In terms of the newer ballistic nomenclature, C D, we may rewrite K D as. C D = 8/π K D. so that the the equation for G is. G (m) = π/8 C D (m) p 0 | v |. The acceleration of the bullet, due to drag, in terms of C D is. aD = -p π/8 C D (m)/C | v | v. NOTE: that in the preceding equation, the C D is that of the "standard" bullet ..., Calculate Power Factor from muzzle velocity, bullet diameter and bullet weight. Divisions for TSA, IDPA, IPSC, USPSA and SASS are displayed. SASS has a maximum velocity that is taken into account. Explanation of terms. Bullet Weight (5.0 to 15000.0 gr) [115.0] [?] gr gm. Caliber (0.100 to 2.000 in) [0.355] [?], Ballistics calculations and formulas for small arms. Drag Function Conversion. Convert a ballistic coefficient from one drag function to another., Its effect is negligible at medium distances, but becomes important around 1000yds and beyond, especially because it can add to other minimal errors and keep you off target. Coriolis effect affects everything not firmly attached to the Earth’s surface. It affects fluids, like air and water, as well as floating and flying objects like ships ..., Trajectory. Calculate a trajectory from bullet, velocity, firearm and atmospheric parameters. Explanation of terms. Ballistics calculations and formulas for small arms., It's also much more. With a vast library of nearly 5,000 projectiles and factory loads, rangefinder, range log, and head-up display, Ballistic is a complete mobile companion for hunting or at the range. Ballistic's world renowned JBM ballistics engine delivers the gold standard in calculations that other applications compare themselves to., Here is a small ballistic card that a drew up for my SPS Tactical. Its using FGMM 168gr Match ammo, 100yd zero, 2520fps Initail Velocity, 10Mph wind either direction, (so adjust either left or right the required values), 0Mph lead. ... The folks on SC think that the JBM calc is really good and accurate and recommend it to many. I havent used ...