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Exterior ballistics

1904 Views 5 Replies 5 Participants Last post by  Lasre
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).

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The RCBS Load program aslo can accomodate step BC's, but since I own it, I can tell you there are better programs for the money.

The best way for you to get a semi-accurate BC for your bullets will be to shoot them through a chronograph at varying distances from the muzzle of your weapon. I would only do this at extended ranges if I where shooting a scoped accurate handgun of a good rest and had not ben drinink any caffiene on that particular day....skyscreens can get expensive. This entire operation would depend on PRECISE yardage measurements ans shooting to be succesfull. The shooting would best be accomplished in as short of period time, on the same day, as possible to help minimize your error for temperature and atmospheric pressure, wind, etc, etc. You would also want to start with a load that you know has an extremely low SD or the attained data would be questionable.
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