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Rifles, Reloading, Optics, Equipment
Reloading
Primer seating
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<blockquote data-quote="Mikecr" data-source="post: 1433635" data-attributes="member: 1521"><p>Have you ever wondered why a load likes one primer over another? Why trying different primers to 'see which is best' seems such an abstract?</p><p>Ask 'what primers work best for 6BR', and you'll get every brand of small rifle primer, but your testing will only show one or two that are clearly better -for you. That is, IF you tested.</p><p></p><p>Well I don't know why. I'll declare that.</p><p>But I have discovered that LOCAL primer striking plays a big role in it.</p><p>If you have some really nice grouping going for you, and you alter firing pin protrusion, FP fall, FP weight, FP spring, trigger sear location & lock time, head space, primer seating/position, or any primer changes, that grouping can be affected from marginal(better or worse) to an extreme worse.</p><p>With any issue here, you might never reach best from your system, and all the while every primer can fire just fine.. BANG with every trigger pull..</p><p>You could be happy with your development leading to a 1/2moa shooter, while oblivious to a gremlin limiting your efforts to just that.</p><p></p><p>There is testing you can do, things you can watch for, and it helps in this to hold consistent headspace, and lock primer seating and location into known standards -as actually measured (every round). That's at least a couple easy items to scratch off the list. It helps to set primer pocket depths to a standard, and it helps to preload primers correctly to these depths, again, as actually measured. Controlling head spacing through measure is a given anyone reloading should know.</p><p>The indicated K&M is the only seating system I'm aware of that simultaneously sets primers of varying heights, to pockets of varying depths, to the desired preload(crush), which should begin at manufacture's recommended (2-4thou crush). It does it fast & easy, and it's a pretty good seater overall.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1433635, member: 1521"] Have you ever wondered why a load likes one primer over another? Why trying different primers to 'see which is best' seems such an abstract? Ask 'what primers work best for 6BR', and you'll get every brand of small rifle primer, but your testing will only show one or two that are clearly better -for you. That is, IF you tested. Well I don't know why. I'll declare that. But I have discovered that LOCAL primer striking plays a big role in it. If you have some really nice grouping going for you, and you alter firing pin protrusion, FP fall, FP weight, FP spring, trigger sear location & lock time, head space, primer seating/position, or any primer changes, that grouping can be affected from marginal(better or worse) to an extreme worse. With any issue here, you might never reach best from your system, and all the while every primer can fire just fine.. BANG with every trigger pull.. You could be happy with your development leading to a 1/2moa shooter, while oblivious to a gremlin limiting your efforts to just that. There is testing you can do, things you can watch for, and it helps in this to hold consistent headspace, and lock primer seating and location into known standards -as actually measured (every round). That's at least a couple easy items to scratch off the list. It helps to set primer pocket depths to a standard, and it helps to preload primers correctly to these depths, again, as actually measured. Controlling head spacing through measure is a given anyone reloading should know. The indicated K&M is the only seating system I'm aware of that simultaneously sets primers of varying heights, to pockets of varying depths, to the desired preload(crush), which should begin at manufacture's recommended (2-4thou crush). It does it fast & easy, and it's a pretty good seater overall. [/QUOTE]
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