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Is there a formula/equation to determine FPS of reduced loads?
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01-16-2009, 11:25 PM
Paul5388
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Lyman's 49th Edition lists a 125 gr bullet with 17.7 gr of 2400 at 1478 fps. They also list 13.0 gr at 1159 fps. Using your "formula", 13.0/17.7=.73446*1478=1085 fps. That's 6% less than the actual velocity, but I suppose it's approximate.
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