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Rifles, Reloading, Optics, Equipment
Reloading
Why I Crimp
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<blockquote data-quote="J E Custom" data-source="post: 2040656" data-attributes="member: 2736"><p>I finally finished one of the test I wanted to do and here are the results.</p><p>This test was conducted at 50 Yards to minimize wind problems that could effect the 30 grain bullet of the 22 WMR. (Gusting up to 20 MPH)</p><p></p><p>All test were with the best AMMO for my rifle to hopefully get the best test differences.</p><p></p><p>Factory loadings were very close to the results of the last test without crimping 160 ft/sec difference in velocities compared to 161 ft/sec earlier test.</p><p></p><p>Crimping was done in a lee FCD with Schell holder I built to hold the 22 WMR without crushing the fragile case.</p><p></p><p>The first amount of crimp was .004 thousandths smaller than the parent case diameter at the bullet. Group size was .101 (At 50 yards) SD's were 27.9 and velocity stayed close to the factory velocities.</p><p></p><p>Next was the .007 thousandths crimp. group size went to .377 and SD's up to 31.2 velocity increased by an average of 20 ft/sec.</p><p></p><p>Then came the .010 thousandths crimp. Group went to .675 and velocity increased by 50 ft/sec.</p><p>The interesting thing was that the group POI also shifted1" to the left.</p><p></p><p>The final test was .012 thousandths and the group opened up to almost .925 and velocity exceeded 2300 ft/sec.</p><p></p><p>I feel the test was successful in that It did show that different crimps can effect the group, SD's, POI and velocities. It also showed me that .004 to ,006 thousandths crimp appears to be the best performer in accuracy in my rifle.</p><p></p><p>Now to shoot the rifle at 100 yards to see what it will do.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 2040656, member: 2736"] I finally finished one of the test I wanted to do and here are the results. This test was conducted at 50 Yards to minimize wind problems that could effect the 30 grain bullet of the 22 WMR. (Gusting up to 20 MPH) All test were with the best AMMO for my rifle to hopefully get the best test differences. Factory loadings were very close to the results of the last test without crimping 160 ft/sec difference in velocities compared to 161 ft/sec earlier test. Crimping was done in a lee FCD with Schell holder I built to hold the 22 WMR without crushing the fragile case. The first amount of crimp was .004 thousandths smaller than the parent case diameter at the bullet. Group size was .101 (At 50 yards) SD's were 27.9 and velocity stayed close to the factory velocities. Next was the .007 thousandths crimp. group size went to .377 and SD's up to 31.2 velocity increased by an average of 20 ft/sec. Then came the .010 thousandths crimp. Group went to .675 and velocity increased by 50 ft/sec. The interesting thing was that the group POI also shifted1" to the left. The final test was .012 thousandths and the group opened up to almost .925 and velocity exceeded 2300 ft/sec. I feel the test was successful in that It did show that different crimps can effect the group, SD's, POI and velocities. It also showed me that .004 to ,006 thousandths crimp appears to be the best performer in accuracy in my rifle. Now to shoot the rifle at 100 yards to see what it will do. J E CUSTOM [/QUOTE]
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