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Old 06-30-2008 | 03:08 PM
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gleason.chapman
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Default RE: How to use a Ballistics Program

Lets intrepret this output, the high point of the arc for a 150 yard zero is 75 yards, so lets pick that, since we don't want to shoot for the neck and miss it all together. Here are the figures at 75 yards:

Fps inches
1700 + 3.6
1800 + 3.1
1900 + 2.7
2000 + 2.4
2100 + 2.1

So we gain a full 1/2" in better trajectory going 100 fps more from 1700 to 1800 fps. We gain a whole 1.2" by taking speed up from 1700 to 2000 and 1.5" by taking the speed up 400 fps from 1700 fps.Most rifles have a sweet point for accuracy, but can go up 100 fps to gain some trajectory improvement. You also know then over most of the range your shooting that when you shoot say 1800 fps your shooting thru a 6" pipe from 0 to 175 yards with a 150 yard zero. You can do the same thing with 250 vs 300g bullets and see where that gets you or compare and flat nose bullet vs a spire pointed bullet like the SST. Other may want to chime in here on how they use their ballistic program.
Chap Gleason
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