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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Real world drops and Shooter app vastly different. 6.5 Saum, 156 EOL Bergers, RL26
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<blockquote data-quote="7mmTikkaShooter" data-source="post: 2313346" data-attributes="member: 92915"><p>There are two basic ways to true a ballistic calculator; first you can just adjust the velocity so it matches up, or you can adjust the bullet b.c. in the calculation. I actually prefer the latter because with a chronograph you can actually gather data to input and it's impossible to know how much the b.c. is effected after the bullet gets slightly deformed after being pushed through the rifling. That deformation is slightly different with every barrel and immeasurable outside of measuring the difference in drop. In your case however, I've run your load through my Applied Ballistics app and can't make any adjustments that can make sense out of your results. Either your velocities are off by several hundred FPS or the b.c. is off by....a lot. My only conclusion, assuming that you've turned over every stone like it sounds you have, is that there's something happening to those projectiles either in the bore or during the flight. Is your twist rate fast enough to stabilize those bullets? Any sign of keyholing or slightly oblong holes in the target? Maybe an unstable bullet would lose its efficiency? Just some thoughts. I'm interested to hear what you find. Keep us informed.</p></blockquote><p></p>
[QUOTE="7mmTikkaShooter, post: 2313346, member: 92915"] There are two basic ways to true a ballistic calculator; first you can just adjust the velocity so it matches up, or you can adjust the bullet b.c. in the calculation. I actually prefer the latter because with a chronograph you can actually gather data to input and it’s impossible to know how much the b.c. is effected after the bullet gets slightly deformed after being pushed through the rifling. That deformation is slightly different with every barrel and immeasurable outside of measuring the difference in drop. In your case however, I’ve run your load through my Applied Ballistics app and can’t make any adjustments that can make sense out of your results. Either your velocities are off by several hundred FPS or the b.c. is off by....a lot. My only conclusion, assuming that you’ve turned over every stone like it sounds you have, is that there’s something happening to those projectiles either in the bore or during the flight. Is your twist rate fast enough to stabilize those bullets? Any sign of keyholing or slightly oblong holes in the target? Maybe an unstable bullet would lose its efficiency? Just some thoughts. I’m interested to hear what you find. Keep us informed. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Real world drops and Shooter app vastly different. 6.5 Saum, 156 EOL Bergers, RL26
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