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Rifles, Reloading, Optics, Equipment
Reloading
On Paper Vs Ballistic Program
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<blockquote data-quote="Eaglet" data-source="post: 164116" data-attributes="member: 3756"><p>Shawn, I agree with you.</p><p>I have three ballistic programs and they all three give me the same results for distances up to 1000+ yards. When using the G1 drag model even when it may not be the proper model, most programs are accurate to 500, 600 yards. In your case, something is not right, for example at sea level with MV=3355, your should zero at 2.4 high at 100 yards to be dead on at 300. At 7000 ft elevation, you would have to zero at 2.2" high at 100 to be dead on at 300. Tht's if your scope hight is 1.8" or so. Therefore your info is not making sence. If at 100 yrds you're 2.8" high, then at 300 you should be 1" high. At sea level that is. Then I would make sense to say: 2.8" hight at 100 and 3.5" low at 368 yards. Now if I play with the muzzle velocity, for example, if MV=2850 f/s, BC=0.507,Elev=0, 2.8" high impact point at 100 yards; now it would be exactly 3.5" low at 300 yards.</p><p>I'm lost friend, I don't know what's doing that! In the past I loaded 180 grains accubond using retumbo 100.0 gr. and I was getting high pressures. and velocities way over 3400 f/s; therefore I could not say you are running velocities of 2850 unless your barrel is shot out and your chrony is no good. </p><p>What are the chances of that to be so? Probably slim.</p><p>Try shooting at 400 yards, if your impact point is close to 16" low then your muzzle velocity would have to be 2850 f/s, that's again assuming you are at sea level and your scope is mounted 1.8" high.</p><p>Good luck!</p></blockquote><p></p>
[QUOTE="Eaglet, post: 164116, member: 3756"] Shawn, I agree with you. I have three ballistic programs and they all three give me the same results for distances up to 1000+ yards. When using the G1 drag model even when it may not be the proper model, most programs are accurate to 500, 600 yards. In your case, something is not right, for example at sea level with MV=3355, your should zero at 2.4 high at 100 yards to be dead on at 300. At 7000 ft elevation, you would have to zero at 2.2" high at 100 to be dead on at 300. Tht's if your scope hight is 1.8" or so. Therefore your info is not making sence. If at 100 yrds you're 2.8" high, then at 300 you should be 1" high. At sea level that is. Then I would make sense to say: 2.8" hight at 100 and 3.5" low at 368 yards. Now if I play with the muzzle velocity, for example, if MV=2850 f/s, BC=0.507,Elev=0, 2.8" high impact point at 100 yards; now it would be exactly 3.5" low at 300 yards. I'm lost friend, I don't know what's doing that! In the past I loaded 180 grains accubond using retumbo 100.0 gr. and I was getting high pressures. and velocities way over 3400 f/s; therefore I could not say you are running velocities of 2850 unless your barrel is shot out and your chrony is no good. What are the chances of that to be so? Probably slim. Try shooting at 400 yards, if your impact point is close to 16" low then your muzzle velocity would have to be 2850 f/s, that's again assuming you are at sea level and your scope is mounted 1.8" high. Good luck! [/QUOTE]
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