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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
WARNING: NORMA "Whitetail" 6.5 Creedmoor 140gr. SP ammunition- Overpressure!
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<blockquote data-quote="bert2368" data-source="post: 2330546" data-attributes="member: 93675"><p>With all due respect, please read the OP a little more carefully.</p><p></p><p>Note the bit about checking function with TWO OTHER TYPES OF FACTORY AMMUNITION, WITH SAME PROJECTILE WEIGHT AND SIMILAR CLAIMED VELOCITIES, AFTER observing the condition of the NORMA brass. And that these two tests did not produce pierced primers, dramatic primer craters or brass flow into ejector cutout. And that the other ammunition ejected the brass normally, not several feet further away and spread out over a much wider angle.</p><p></p><p>I didn't mention it earlier, but these other two types of factory ammunition also didn't exhibit large amounts of vertical stringing. They were Federal 140gr. SP "Nontypical Whitetail" which is claimed as @ 2,750fps and Federal 140gr. Fusion BSP which is claimed as @ 2,725fps. The NORMA 140gr. SP is claimed as @ 2,756fps. I will attach pictures of THEIR case heads and again post what the NORMA case heads looked like for your edification & enjoyment.</p><p></p><p></p><p>I've had the rifle for a couple of years. I've fired 6 different commercial loads from 4 different manufacturers. I've also done 3 different load workup strings for hand loading, running loads up to near book max with two 140gr. conventional (Speer and Hornady) and 120gr. solid Copper Barnes TTSX bullets.</p><p></p><p>None of the commercial loads OR my handloads have EVER pierced primers, dramatically cratered primers, loosened primer pockets, blown out a primer, completely flattened the curve out of the edges of primer cups or flowed brass into ejector cutout of bolt. Let alone doing several of those things on every shot.</p><p></p><p>Incidentally.</p><p></p><p><span style="font-family: '-apple-system'"><span style="color: rgb(32, 33, 34)">The </span></span><a href="https://en.m.wikipedia.org/wiki/SAAMI" target="_blank"><span style="color: rgb(51, 102, 204)"><span style="font-family: '-apple-system'">SAAMI</span></span></a><span style="font-family: '-apple-system'"><span style="color: rgb(32, 33, 34)"> Maximum Average Pressure (MAP) for 6.5CM is 62,000 psi piezo </span></span></p><p><span style="font-family: '-apple-system'"><span style="color: rgb(32, 33, 34)"></span></span></p><p><span style="font-family: '-apple-system'"><span style="color: rgb(32, 33, 34)">The </span></span><a href="https://en.m.wikipedia.org/wiki/C.I.P." target="_blank"><span style="color: rgb(51, 102, 204)"><span style="font-family: '-apple-system'">C.I.P.</span></span></a><span style="font-family: '-apple-system'"><span style="color: rgb(32, 33, 34)"> maximum pressure for 6.5CM is 63,091 psi piezo. </span></span></p><p><span style="font-family: '-apple-system'"><span style="color: rgb(32, 33, 34)"></span></span></p><p><span style="font-family: '-apple-system'"><span style="color: rgb(32, 33, 34)">SAAMI MAP for .308 Win is 62,000 psi piezo.</span></span></p><p></p><p><span style="color: #202122">The original spec given for 7.62x51NATO is 50,000psi- BUT! this spec is from the olden days of Copper crusher tests. In reality, 7.62x51 NATO pressure is just about exactly equal to a piezo measurement of 60,000. </span></p><p><span style="color: #202122"></span></p><p><span style="color: #202122">There is not enough ddifference between ANY of these specifications to matter, given correctly made case head brass and primer cups. Buy "high pressure bolts" and extra skinny firing pins if you feel like it, it can't HURT.</span></p><p><span style="color: #202122"></span></p><p><span style="color: #202122">The firing pin hole size, even if it WERE too large would not cause brass to flow into my ejector cutout.</span></p><p></p><p>Federal 140gr. Fusion:</p><p></p><p>[ATTACH=full]309492[/ATTACH]</p><p></p><p>Federal 140gr. Nontypical whitetail:</p><p></p><p>[ATTACH=full]309491[/ATTACH]</p><p></p><p>Norma 140gr. Whitetail: Note the two cases on left, you can see the primer anvils!</p><p></p><p>I placed the side with ejector marks closest to camera on this picture. I can see it clearly in real life, it's somewhat visible in at least the center 3 cases even in the photo.</p><p></p><p>Once again, NONE of the other loads fired show similar ejector marks.</p><p></p><p>[ATTACH=full]309493[/ATTACH]</p></blockquote><p></p>
[QUOTE="bert2368, post: 2330546, member: 93675"] With all due respect, please read the OP a little more carefully. Note the bit about checking function with TWO OTHER TYPES OF FACTORY AMMUNITION, WITH SAME PROJECTILE WEIGHT AND SIMILAR CLAIMED VELOCITIES, AFTER observing the condition of the NORMA brass. And that these two tests did not produce pierced primers, dramatic primer craters or brass flow into ejector cutout. And that the other ammunition ejected the brass normally, not several feet further away and spread out over a much wider angle. I didn't mention it earlier, but these other two types of factory ammunition also didn't exhibit large amounts of vertical stringing. They were Federal 140gr. SP "Nontypical Whitetail" which is claimed as @ 2,750fps and Federal 140gr. Fusion BSP which is claimed as @ 2,725fps. The NORMA 140gr. SP is claimed as @ 2,756fps. I will attach pictures of THEIR case heads and again post what the NORMA case heads looked like for your edification & enjoyment. I've had the rifle for a couple of years. I've fired 6 different commercial loads from 4 different manufacturers. I've also done 3 different load workup strings for hand loading, running loads up to near book max with two 140gr. conventional (Speer and Hornady) and 120gr. solid Copper Barnes TTSX bullets. None of the commercial loads OR my handloads have EVER pierced primers, dramatically cratered primers, loosened primer pockets, blown out a primer, completely flattened the curve out of the edges of primer cups or flowed brass into ejector cutout of bolt. Let alone doing several of those things on every shot. Incidentally. [FONT=-apple-system][COLOR=rgb(32, 33, 34)]The [/COLOR][/FONT][URL='https://en.m.wikipedia.org/wiki/SAAMI'][COLOR=rgb(51, 102, 204)][FONT=-apple-system]SAAMI[/FONT][/COLOR][/URL][FONT=-apple-system][COLOR=rgb(32, 33, 34)] Maximum Average Pressure (MAP) for 6.5CM is 62,000 psi piezo The [/COLOR][/FONT][URL='https://en.m.wikipedia.org/wiki/C.I.P.'][COLOR=rgb(51, 102, 204)][FONT=-apple-system]C.I.P.[/FONT][/COLOR][/URL][FONT=-apple-system][COLOR=rgb(32, 33, 34)] maximum pressure for 6.5CM is 63,091 psi piezo. SAAMI MAP for .308 Win is 62,000 psi piezo.[/COLOR][/FONT] [COLOR=#202122]The original spec given for 7.62x51NATO is 50,000psi- BUT! this spec is from the olden days of Copper crusher tests. In reality, 7.62x51 NATO pressure is just about exactly equal to a piezo measurement of 60,000. There is not enough ddifference between ANY of these specifications to matter, given correctly made case head brass and primer cups. Buy "high pressure bolts" and extra skinny firing pins if you feel like it, it can't HURT. The firing pin hole size, even if it WERE too large would not cause brass to flow into my ejector cutout.[/COLOR] Federal 140gr. Fusion: [ATTACH type="full" alt="20211105_220737.jpg"]309492[/ATTACH] Federal 140gr. Nontypical whitetail: [ATTACH type="full" alt="20211105_220425.jpg"]309491[/ATTACH] Norma 140gr. Whitetail: Note the two cases on left, you can see the primer anvils! I placed the side with ejector marks closest to camera on this picture. I can see it clearly in real life, it's somewhat visible in at least the center 3 cases even in the photo. Once again, NONE of the other loads fired show similar ejector marks. [ATTACH type="full" alt="20211105_121418.jpg"]309493[/ATTACH] [/QUOTE]
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WARNING: NORMA "Whitetail" 6.5 Creedmoor 140gr. SP ammunition- Overpressure!
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