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Rifles, Reloading, Optics, Equipment
Reloading
Seating depth advice
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<blockquote data-quote="Mikecr" data-source="post: 2226648" data-attributes="member: 1521"><p>In general, unless seated land relationship is relied on to hold a high starting pressure(i.e. in the lands), then seating does not have to be readjusted once found -with that bullet, -for the accurate life of the barrel.</p><p>The BR shooters <u>who</u> <u>do</u> adjust seating(commonly) are the point blank shooters. This, because they're shooting underbores that absolutely rely on certain starting pressures(6PPC, 30BR, etc). They also need tightest cutting edge up to the minute group shaping. </p><p>I suppose seating could be tweaked(slightly) at 1kyd for tightest/up to the minute group shaping also. </p><p>But we're talking about potentials different from full seating testing.</p><p></p><p>CBTO is a coarse adjustment to results that is not tuning for all but maybe 1 in 10,000 shooters(non PB BR). </p><p>It is little different than primer/striking adjustments. Did you know that you can open-close-open grouping with firing pin fall adjustments? You can, and it's not tuning. It's merely coming in & out of optimum for the chosen primer and crush.</p><p>With seating, it's similar in that you're coming in & out of optimum bullet-barrel interfacing.</p><p></p><p>A side affect of large CBTO adjustments is minor changes of load density and neck tension. This can affect the character of POWDER TUNE. It can collapse an edgy powder tune, and that's why full seating testing should be clear of any powder tune.</p><p>You want to see results of full seating testing in itself, and THEN move on to actual tuning.</p><p>You want to get your best primer/striking, and rest/bag adjustments before moving on to tuning as well.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2226648, member: 1521"] In general, unless seated land relationship is relied on to hold a high starting pressure(i.e. in the lands), then seating does not have to be readjusted once found -with that bullet, -for the accurate life of the barrel. The BR shooters [U]who[/U] [U]do[/U] adjust seating(commonly) are the point blank shooters. This, because they're shooting underbores that absolutely rely on certain starting pressures(6PPC, 30BR, etc). They also need tightest cutting edge up to the minute group shaping. I suppose seating could be tweaked(slightly) at 1kyd for tightest/up to the minute group shaping also. But we're talking about potentials different from full seating testing. CBTO is a coarse adjustment to results that is not tuning for all but maybe 1 in 10,000 shooters(non PB BR). It is little different than primer/striking adjustments. Did you know that you can open-close-open grouping with firing pin fall adjustments? You can, and it's not tuning. It's merely coming in & out of optimum for the chosen primer and crush. With seating, it's similar in that you're coming in & out of optimum bullet-barrel interfacing. A side affect of large CBTO adjustments is minor changes of load density and neck tension. This can affect the character of POWDER TUNE. It can collapse an edgy powder tune, and that's why full seating testing should be clear of any powder tune. You want to see results of full seating testing in itself, and THEN move on to actual tuning. You want to get your best primer/striking, and rest/bag adjustments before moving on to tuning as well. [/QUOTE]
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Seating depth advice
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