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Exterior ballistics

1898 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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Hi, Craig:
Federal's CastCores have the only published WFN ballistics I've seen. They're on page 15 of this PDF.

The BC looks like it's around .215. It's jumps around at each range but that's likely from rounding off to the nearest 10 fps. Besides, quoting BCs to 3 decimal places gets you paper precision that's unobtainable in the field. Sierra's numbers show a drop in BC below 900 fps for comparable bullets. However my home brewed Ballistics program only shows a difference of 0.9" at 200 yards with a 100 yard zero, using BCs of .220 and .190.

So far as I know only the Sierra and Oehler programs allow a variable BC.

You should check out the calculator that IDShooter mentioned, as it's very precise, much better than mine. However, unless you can find accurate BCs for your bullets, a range test of drop is the best answer.

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