Exterior ballistics

1898 Views 5 Replies 5 Participants Last post by Lasre, Jul 13, 2003

Lasre

Discussion Starter · Jul 11, 2003

I am not sure if this is the ideal forum but I could not see a beetter one.
Does anyone know of a ballistics program that models trajectorries of 44 240gn & 300gn WFN bullets when driven at 1030fps. This is a awkward speed as close to the speed of sound the BC tend to change in value very rapidly with a very small change in projectile speed. I would like to model the trajectory out to 150 metres at least. I currently shoot rabbits out to 170+metres with a silenced 22Lr (silencers use is actively encouraged in NZ). I would like to try out the 44 to a similar distance on goats and rabbits initially (there are more rabbits thsan goats to practice on).

Cheers,
Craig.

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Lasre

Discussion Starter · #6 · Jul 13, 2003

Thanks guys, I have Arthur Pejsa's & Quicktarget. I will try working out the bc based on the figures given for muzzle velocity and 100yd velocity in Federals catalog. The point I was getting at is that from the Sierra manual at 900fps the bc on a 240gn 44 JHC is 0.17 by 1050fps it has increased to 0.24 by 1100fps it is back down to 0.17 and from 1200fps up it has settled down to 0.18 I have used both to model 22Lr out to 220 metres and the curve does not follow the actual curve it is close but it is in error both up and down at various ranges. What is quite interesting is that we have to alter our holdover during the day less at the hottest part and more at dusk it is upto 1/2 a mil at times at 150metres.

Regards,
Craig.

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