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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Blew a Primer _ Analysis
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<blockquote data-quote="Pdvdh" data-source="post: 1389760" data-attributes="member: 4191"><p>Thanks Steve,</p><p>I really have no accurate means of measuring down to the 0.0001". The barrel is a Krieger 4-groove, 9.5 twist. I think Krieger advertises 0.308" groove diameter and 0.300" land diameter.</p><p></p><p>The <strong>conundrum</strong> is, <u>again</u>: Unless the manufacturing tolerance on the two bullets I fired was substantially different, then the same basic bullet yielded two pretty different pressures, in the reverse direction anticipated based on measured case web swell and MV.</p><p></p><p>I measured a number of bullets with my calipers. All measured the same, to the limitation of my calipers and eyes. I do have good vision... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p>I have shot this brand bullet in two other rifles (.284 and .338 calibers) enough to be getting a warm fuzzy feeling, with respect to accuracy potential. But in this rifle, only two shots fired thus far due to the resultant elevated pressure indicated on both shots.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1389760, member: 4191"] Thanks Steve, I really have no accurate means of measuring down to the 0.0001". The barrel is a Krieger 4-groove, 9.5 twist. I think Krieger advertises 0.308" groove diameter and 0.300" land diameter. The [B]conundrum[/B] is, [U]again[/U]: Unless the manufacturing tolerance on the two bullets I fired was substantially different, then the same basic bullet yielded two pretty different pressures, in the reverse direction anticipated based on measured case web swell and MV. I measured a number of bullets with my calipers. All measured the same, to the limitation of my calipers and eyes. I do have good vision... ;) I have shot this brand bullet in two other rifles (.284 and .338 calibers) enough to be getting a warm fuzzy feeling, with respect to accuracy potential. But in this rifle, only two shots fired thus far due to the resultant elevated pressure indicated on both shots. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Blew a Primer _ Analysis
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