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Rifles, Reloading, Optics, Equipment
Reloading
Loading to magazine length/bent tips
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<blockquote data-quote="QuietTexan" data-source="post: 2215727" data-attributes="member: 116181"><p>It very much so depends on the ogive profile of the bullet. Bullets with secant profiles like ABLRs, Hornady ELDs, Berger VLDs can shoot fine with significant jump, they just might be more sensitive to changes in seating depth than tangent ogive profiles. The logic behind seating them deeper (see the link to Cal's study in the previous post) when they might typically shoot their best close to the lands is you can find a wider node set deeper where shot to shot variation is reduced. You might not have the absolute most efficient pairing of accuracy and precision like if you sat touching the lands, but you are in a more forgiving range that reduces shot to shot variance as the throat erodes in the barrel.</p><p></p><p>In my 300 RUM, ABLRs shoot better set back towards the SAAMI COL of 3.600", but 212 ELD-Xs and 210 VLDs don't. So it still comes down to figuring out what works best in your gun. I went to a fourth bullet option (Hammer 178 AHs and 180 HHs) instead of doing the Wyatt's box to see if a bullet change would negate the need to shoot such long loads.</p><p></p><p></p><p></p><p>This chart from Cal's article is the crux of the matter - when comparing change in vertical by change in seating depth, the node is where variations in seating depth result in the least change, not where they produce the absolute smallest grouping. It pairs with his articles on statistics in shot groups in the context of PRC, where target size is relatively large and round counts are high. It's NOT a benchrest philosophy for chasing the smallest, most precise groups, it's a practical philosophy based on the constraints imposed in another discipline that rewards speed and accuracy over absolute precision and accuracy combined.</p><p>[ATTACH=full]278834[/ATTACH]</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2215727, member: 116181"] It very much so depends on the ogive profile of the bullet. Bullets with secant profiles like ABLRs, Hornady ELDs, Berger VLDs can shoot fine with significant jump, they just might be more sensitive to changes in seating depth than tangent ogive profiles. The logic behind seating them deeper (see the link to Cal's study in the previous post) when they might typically shoot their best close to the lands is you can find a wider node set deeper where shot to shot variation is reduced. You might not have the absolute most efficient pairing of accuracy and precision like if you sat touching the lands, but you are in a more forgiving range that reduces shot to shot variance as the throat erodes in the barrel. In my 300 RUM, ABLRs shoot better set back towards the SAAMI COL of 3.600", but 212 ELD-Xs and 210 VLDs don't. So it still comes down to figuring out what works best in your gun. I went to a fourth bullet option (Hammer 178 AHs and 180 HHs) instead of doing the Wyatt's box to see if a bullet change would negate the need to shoot such long loads. This chart from Cal's article is the crux of the matter - when comparing change in vertical by change in seating depth, the node is where variations in seating depth result in the least change, not where they produce the absolute smallest grouping. It pairs with his articles on statistics in shot groups in the context of PRC, where target size is relatively large and round counts are high. It's NOT a benchrest philosophy for chasing the smallest, most precise groups, it's a practical philosophy based on the constraints imposed in another discipline that rewards speed and accuracy over absolute precision and accuracy combined. [ATTACH type="full" alt="Bullet-Jump-for-Berger-105gr-Hybrid-with-Trend-Lines-645x450.png"]278834[/ATTACH] [/QUOTE]
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