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Old 10-19-2011, 01:10 PM
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Most velocities are listed as being from 24' barrels. With a .243 (or similar) you can use a rule of thumb of about 30 FPS +/- loss of velocity for every inch less of barrel length. From 24" to 18" would then mean a loss of about 180 FPS or so. Each rifle is different but these numbers should be close enough to give you an idea and to re-calculate trajectory numbers, should you feel that necessary.
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