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Rifles, Reloading, Optics, Equipment
Reloading
Federal GM210M vs CCI BR-2 LR Primers
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<blockquote data-quote="Bart B" data-source="post: 115914" data-attributes="member: 5302"><p>[ QUOTE ]</p><p>Short range accuracy on both rifles was similar. The major difference was that one rifle exhibited terrible extreme velocity fluctuations which I couldn't correct.</p><p></p><p>[/ QUOTE ]A very common problem when firing pin springs get weak and they all do over time. If the spring's over 3 years old, it may need replaced. I'd replace the firing pin spring with a new one and see what happens. </p><p></p><p>Many rifle's factory springs aren't strong enough to smack primers hard enough to detonate them uniformly One with at least 10 to 20 percent stronger preload force will usually reduce muzzle velocity spread. For example, Winchester 70 factory springs are rated about 23 pounds when cocked. I use 26 to 28 pound ones and get much better muzzle velocity spreads and accuracy.</p><p></p><p>Another cause of large spreads in muzzle velocity is the firing pin doesn't stick far enough out of the bolt face. It should be between .055- and .060-inch for large rifle primers.</p></blockquote><p></p>
[QUOTE="Bart B, post: 115914, member: 5302"] [ QUOTE ] Short range accuracy on both rifles was similar. The major difference was that one rifle exhibited terrible extreme velocity fluctuations which I couldn't correct. [/ QUOTE ]A very common problem when firing pin springs get weak and they all do over time. If the spring's over 3 years old, it may need replaced. I'd replace the firing pin spring with a new one and see what happens. Many rifle's factory springs aren't strong enough to smack primers hard enough to detonate them uniformly One with at least 10 to 20 percent stronger preload force will usually reduce muzzle velocity spread. For example, Winchester 70 factory springs are rated about 23 pounds when cocked. I use 26 to 28 pound ones and get much better muzzle velocity spreads and accuracy. Another cause of large spreads in muzzle velocity is the firing pin doesn't stick far enough out of the bolt face. It should be between .055- and .060-inch for large rifle primers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Federal GM210M vs CCI BR-2 LR Primers
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