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Rifles, Reloading, Optics, Equipment
Reloading
Why I Crimp
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<blockquote data-quote="Bob Wright" data-source="post: 2418430" data-attributes="member: 104363"><p>Ok, so I picked up a crimp die for my 7RM and reworked 15 rounds left after this falls hunt.</p><p>180 Berger VLD H</p><p>Fed 215 Mag primer</p><p>RE23 </p><p>.002 neck tension</p><p>Annealed Nosler brass</p><p>26" 8.5 twist, braked Krieger #5 heavy sporter contour </p><p>5 shot groups</p><p>Lee FCD crimp die</p><p>Lab Radar</p><p></p><p>1. Uncrimped: fouled bore, average speed 2936 fps</p><p>ES 38 (including 1st shot that was 22 above average fps). 4 remaining shots had ES 20.</p><p></p><p>2. 1/8 turn crimp: average speed 2932 fps, ES 10</p><p></p><p>3. 1/4 turn crimp: average speed 2934 fps, ES 35 (including first shot that was 28 fps above average, light ejector)</p><p>4 remaining shots had ES 17</p><p></p><p>This rifle has a very tolerant attitude regarding ES but it's convincing to me that crimping 1/8 turn is about 1/2 the ES of .002 neck tension in uncrimped rounds. The 1/4 turn sends ES up 7 fps over the 1/8 turn crimp.</p><p>POI is still holding over all 3 groups. </p><p></p><p>So, some more data points on the Lee FCD.</p><p>Credit to Bean and those that are doing it.</p></blockquote><p></p>
[QUOTE="Bob Wright, post: 2418430, member: 104363"] Ok, so I picked up a crimp die for my 7RM and reworked 15 rounds left after this falls hunt. 180 Berger VLD H Fed 215 Mag primer RE23 .002 neck tension Annealed Nosler brass 26" 8.5 twist, braked Krieger #5 heavy sporter contour 5 shot groups Lee FCD crimp die Lab Radar 1. Uncrimped: fouled bore, average speed 2936 fps ES 38 (including 1st shot that was 22 above average fps). 4 remaining shots had ES 20. 2. 1/8 turn crimp: average speed 2932 fps, ES 10 3. 1/4 turn crimp: average speed 2934 fps, ES 35 (including first shot that was 28 fps above average, light ejector) 4 remaining shots had ES 17 This rifle has a very tolerant attitude regarding ES but it's convincing to me that crimping 1/8 turn is about 1/2 the ES of .002 neck tension in uncrimped rounds. The 1/4 turn sends ES up 7 fps over the 1/8 turn crimp. POI is still holding over all 3 groups. So, some more data points on the Lee FCD. Credit to Bean and those that are doing it. [/QUOTE]
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Why I Crimp
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