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Rifles, Reloading, Optics, Equipment
Reloading
Primer piercing but weird
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<blockquote data-quote="keithcandler" data-source="post: 1781296" data-attributes="member: 3728"><p>Fed 205, cci 400 have thin cups, and 6 XC's run some pressure I found. I shoot palma brass in my 6 XC, never popped a primer using Rem 7 1/2's. </p><p></p><p>Velocity nodes in a 31" barrel are at 3050,3150, and 3250 with Sierra 107's using a RAS tunner. Brass lasts 8 firings on 3250 fps node, groups very tiny.</p><p></p><p>My Rem 700 does not have the bolt head bushed.</p><p></p><p>Many cases I shoot with small primers will pierce Fed 205, Win, and cci 400. Playing with different primers will change groups so you have to play with primer intensity for your load and primer cup thickness will come into play.</p><p></p><p>CCI 41 is a thick cup primer</p><p>CCI 450 is the hottest thick cup primer other than Wolf and Tula SR Mag primers</p><p>Rem 7 1/2 is a mag thick cup primer. I shoot the 7 1/2 with my loads, H4350 with the 3050 fps and 3150 node and R#17 with the 4250 fps node.</p><p></p><p>It is HARD to pierce a large rifle primer. You really have severe case of over size firing pin hole in the bolt head if you pierce a large rifle primer. I have seen the 257 Weatherby customs have large rifle primer crater that was incredible and none ever pierced.</p><p></p><p>As previously mentioned, going from LR primer brass to small rifle primer brass means a new load work up. I normally add .5g more powder going to a small rifle primer to achieve the same velocity, but that is like an old wives tale...trial and error with chronograph is where the rubber meets the road.</p></blockquote><p></p>
[QUOTE="keithcandler, post: 1781296, member: 3728"] Fed 205, cci 400 have thin cups, and 6 XC's run some pressure I found. I shoot palma brass in my 6 XC, never popped a primer using Rem 7 1/2's. Velocity nodes in a 31" barrel are at 3050,3150, and 3250 with Sierra 107's using a RAS tunner. Brass lasts 8 firings on 3250 fps node, groups very tiny. My Rem 700 does not have the bolt head bushed. Many cases I shoot with small primers will pierce Fed 205, Win, and cci 400. Playing with different primers will change groups so you have to play with primer intensity for your load and primer cup thickness will come into play. CCI 41 is a thick cup primer CCI 450 is the hottest thick cup primer other than Wolf and Tula SR Mag primers Rem 7 1/2 is a mag thick cup primer. I shoot the 7 1/2 with my loads, H4350 with the 3050 fps and 3150 node and R#17 with the 4250 fps node. It is HARD to pierce a large rifle primer. You really have severe case of over size firing pin hole in the bolt head if you pierce a large rifle primer. I have seen the 257 Weatherby customs have large rifle primer crater that was incredible and none ever pierced. As previously mentioned, going from LR primer brass to small rifle primer brass means a new load work up. I normally add .5g more powder going to a small rifle primer to achieve the same velocity, but that is like an old wives tale...trial and error with chronograph is where the rubber meets the road. [/QUOTE]
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Primer piercing but weird
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