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Rifles, Reloading, Optics, Equipment
Reloading
Does anyone see a difference using different primers?
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<blockquote data-quote="Mikecr" data-source="post: 2917007" data-attributes="member: 1521"><p>I do primer swap testing while fire forming brass, looking for lowest ES. This, with CCIs at 4thou crush, everything else at 2thou.</p><p></p><p>I have a theory that this is about local striking (rather than the primer itself).</p><p>I believe that a striking system could be optimized for a given primer, but it's not as easy as simple trial & error primer swapping.</p><p>The reason it's not easy is because we have no striking or primer standards, and the striking system is not externally adjustable.</p><p></p><p>I was forced to do this testing once and found a gain in accuracy that would not have been possible otherwise, with any amount of load development. My firing pin was slipping in it's cocking piece(intermittently), and I did not know where to set it back. So I ran tests similar to full seating testing. Discovered grouping opening/closing/opening just like seating testing. I set the pin at tested optimum -huge difference (1/8moa better than MY best at 3/8moa). That was from my best load (including chosen primer), and wasn't about ES so much as tune consistency.</p><p>But with a new gun I have to start somewhere, so I start with swapping for comparatively low ES.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2917007, member: 1521"] I do primer swap testing while fire forming brass, looking for lowest ES. This, with CCIs at 4thou crush, everything else at 2thou. I have a theory that this is about local striking (rather than the primer itself). I believe that a striking system could be optimized for a given primer, but it's not as easy as simple trial & error primer swapping. The reason it's not easy is because we have no striking or primer standards, and the striking system is not externally adjustable. I was forced to do this testing once and found a gain in accuracy that would not have been possible otherwise, with any amount of load development. My firing pin was slipping in it's cocking piece(intermittently), and I did not know where to set it back. So I ran tests similar to full seating testing. Discovered grouping opening/closing/opening just like seating testing. I set the pin at tested optimum -huge difference (1/8moa better than MY best at 3/8moa). That was from my best load (including chosen primer), and wasn't about ES so much as tune consistency. But with a new gun I have to start somewhere, so I start with swapping for comparatively low ES. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Does anyone see a difference using different primers?
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