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Rifles, Reloading, Optics, Equipment
Reloading
Seating Depth
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<blockquote data-quote="Mikecr" data-source="post: 2706590" data-attributes="member: 1521"><p>I use a functional variant of Berger recommended full seating testing: <a href="https://www.longrangehunting.com/threads/getting-the-best-precision-and-accuracy-from-berger-vld-bullets-in-your-rifle.40204/" target="_blank">https://www.longrangehunting.com/threads/getting-the-best-precision-and-accuracy-from-berger-vld-bullets-in-your-rifle.40204/</a></p><p></p><p>I've found that quality of this testing is contingent on isolation of seating results.</p><p>For many guns seating is way larger than powder, but I can't see seating results as well while coming into or out of a powder node.</p><p>So after running what-ifs in QuickLoad for an incremental load table, I'll run those charges, 2shts each, with seating at ~10thou OTL, to find worst result. This is the charge I'll run seating testing with, and it's usually with new brass that needs fire forming anyway.</p><p>Now I can run wide range coarse seating adjustments without worry of a powder node messing with results.</p><p>If you already know upper/lower powder nodes, you can just pick something between them.</p><p></p><p>For seating I never bother with touching lands. I start 10thou OTL, and 20, 30, 40, etc. 3shts each. Looking for the 1st confirmed group tightening. I'm not going to accept bullet bearing into neck donut area, nor rely on high starting pressure from a close land relationship.</p><p>I might horse around with +/-5thou of something on another run, but this is for best coarse seating.</p><p>The coarse CBTO I choose is logged, and I do a primer swapping test, and MyMax pressure testing while I'm there.</p><p>That's what I'll go back to powder testing with, once my brass is fully fire formed and stable.</p><p></p><p>After powder testing, I go back to my coarse CBTO and fine tweak it within it's window for tightest group shaping.</p><p>Log my final CBTO. I'll never change it for that bullet.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2706590, member: 1521"] I use a functional variant of Berger recommended full seating testing: [URL]https://www.longrangehunting.com/threads/getting-the-best-precision-and-accuracy-from-berger-vld-bullets-in-your-rifle.40204/[/URL] I've found that quality of this testing is contingent on isolation of seating results. For many guns seating is way larger than powder, but I can't see seating results as well while coming into or out of a powder node. So after running what-ifs in QuickLoad for an incremental load table, I'll run those charges, 2shts each, with seating at ~10thou OTL, to find worst result. This is the charge I'll run seating testing with, and it's usually with new brass that needs fire forming anyway. Now I can run wide range coarse seating adjustments without worry of a powder node messing with results. If you already know upper/lower powder nodes, you can just pick something between them. For seating I never bother with touching lands. I start 10thou OTL, and 20, 30, 40, etc. 3shts each. Looking for the 1st confirmed group tightening. I'm not going to accept bullet bearing into neck donut area, nor rely on high starting pressure from a close land relationship. I might horse around with +/-5thou of something on another run, but this is for best coarse seating. The coarse CBTO I choose is logged, and I do a primer swapping test, and MyMax pressure testing while I'm there. That's what I'll go back to powder testing with, once my brass is fully fire formed and stable. After powder testing, I go back to my coarse CBTO and fine tweak it within it's window for tightest group shaping. Log my final CBTO. I'll never change it for that bullet. [/QUOTE]
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