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Rifles, Reloading, Optics, Equipment
Reloading
Primer crush…does it matter?
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<blockquote data-quote="Mikecr" data-source="post: 2582680" data-attributes="member: 1521"><p>In our context, crush is preloading, or pre-sensitizing seated primers.</p><p>2thou of crush used to be recommended as standard from primer makers. As far as I'm aware, there has never been another suggestion about this, one way or another. I have tested it with every primer brand/type I use, and found that it actually does seem best, with exception of CCIs (which for me, prefer 4thou crush).</p><p></p><p>You can resolve a common misconception with an understanding that crush is not directly tied to seating depth, or the case head, or force/feeling. Extrapolating crush from any of these doesn't work at all.</p><p></p><p>The only way to know crush for each primer seated is to actually measure it's crush.</p><p>The ONLY seater that does this is the indicated K&M.</p><p>It's a quality seater. The process is a bit slower in that there is a pre-seating/measure step added to use, but it's built in, you get good at it.</p><p></p><p>Anyway, why pre-sensitize (you may ask)?</p><p>It is to reduce the affect of striking variances, and then ES/SD from our loads. It can remove flyers from cutting edge tunes,</p><p>By reducing the force needed to set off the primer pill, any pin force beyond that need no longer matters. The primer has already gone off before the pin even stops traveling.</p><p></p><p>I don't know how, but consistent primer initiation actually affects results. </p><p>I have witnessed inconsistent striking directly causing significant flyers, that are very difficult to troubleshoot & prove..</p><p>Think about it, how are you going to prove it and fix it? Well, you can eliminate one contributor by setting primers to a standard.</p><p>The rest resides in your striking system. That would be another thread.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2582680, member: 1521"] In our context, crush is preloading, or pre-sensitizing seated primers. 2thou of crush used to be recommended as standard from primer makers. As far as I'm aware, there has never been another suggestion about this, one way or another. I have tested it with every primer brand/type I use, and found that it actually does seem best, with exception of CCIs (which for me, prefer 4thou crush). You can resolve a common misconception with an understanding that crush is not directly tied to seating depth, or the case head, or force/feeling. Extrapolating crush from any of these doesn't work at all. The only way to know crush for each primer seated is to actually measure it's crush. The ONLY seater that does this is the indicated K&M. It's a quality seater. The process is a bit slower in that there is a pre-seating/measure step added to use, but it's built in, you get good at it. Anyway, why pre-sensitize (you may ask)? It is to reduce the affect of striking variances, and then ES/SD from our loads. It can remove flyers from cutting edge tunes, By reducing the force needed to set off the primer pill, any pin force beyond that need no longer matters. The primer has already gone off before the pin even stops traveling. I don't know how, but consistent primer initiation actually affects results. I have witnessed inconsistent striking directly causing significant flyers, that are very difficult to troubleshoot & prove.. Think about it, how are you going to prove it and fix it? Well, you can eliminate one contributor by setting primers to a standard. The rest resides in your striking system. That would be another thread. [/QUOTE]
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Primer crush…does it matter?
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