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POWLEY CALCULATOR |
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Case Length (inches)
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Selection Index
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Bullet Length (inches)
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<65
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No IMR powder Slow enough to work
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Cartridge Length (inches)
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65-81
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IMR 5010
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Water Capacity of
Case(grains)
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81-91
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IMR 4831 Reduced by 5%
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Bullet Diameter (inches)
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91-110
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IMR 4350 or 4831
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Bullet Mass (grains)
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110-124
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IMR 4320, 4895, or 4064
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Height of boattail (inches)
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125-144
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IMR 3031
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Tail Diameter of boattail
(inches)
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145-164
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IMR 4198
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Barrel Length (inches)
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165-180
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IMR 4227
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>180
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No IMR Powder Fast Enough to work
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Powder Factor Selection
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If Powder Selection Index >145 change to .80
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Charge Weight Estimate
(grains)
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Powder Selection Index
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Velocity Estimate (fps)
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