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Rifles, Reloading, Optics, Equipment
Reloading
Fireforming help needed
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<blockquote data-quote="300 Driver" data-source="post: 2829036" data-attributes="member: 91257"><p>So I tried 17.5gr Greendot and COW with a false shoulder. No issues other than it likely needs a stiffer charge. Shoulder was slightly rounded. I measured the COW, one fired Hornady, and 3 fired Peterson cases. The fired cases did not originally have a false shoulder. Just a .010 jam according to my notes.</p><p></p><p>COW:</p><p>Base to shoulder: 2.152</p><p>Neck dia: .372</p><p>Shoulder dia: .520</p><p>Base dia: .532</p><p></p><p>Fired(3 different cases):</p><p>Base to shoulder: 2.157 to 2.164</p><p>Neck dia: .370 to .371</p><p>Shoulder dia: .520 to .521</p><p>Base dia: .535 - .536</p><p></p><p>Unfired Peterson 300PRC with .356 false shoulder:</p><p>Base to shoulder: 2.120</p><p>Neck dia: .367</p><p>Shoulder dia: .516</p><p>Base dia: .530</p><p></p><p>Nothing seems incredibly off base with these measurements. I think the false shoulder may be a better choice for me since the jam was not giving me the proper bolt/case head interface.</p><p></p><p>[ATTACH=full]466288[/ATTACH]</p><p>Hornady COW, Hornady 70gr 780, Peterson 70gr 780, Peterson loaded with false shoulder and .020 jam.</p></blockquote><p></p>
[QUOTE="300 Driver, post: 2829036, member: 91257"] So I tried 17.5gr Greendot and COW with a false shoulder. No issues other than it likely needs a stiffer charge. Shoulder was slightly rounded. I measured the COW, one fired Hornady, and 3 fired Peterson cases. The fired cases did not originally have a false shoulder. Just a .010 jam according to my notes. COW: Base to shoulder: 2.152 Neck dia: .372 Shoulder dia: .520 Base dia: .532 Fired(3 different cases): Base to shoulder: 2.157 to 2.164 Neck dia: .370 to .371 Shoulder dia: .520 to .521 Base dia: .535 - .536 Unfired Peterson 300PRC with .356 false shoulder: Base to shoulder: 2.120 Neck dia: .367 Shoulder dia: .516 Base dia: .530 Nothing seems incredibly off base with these measurements. I think the false shoulder may be a better choice for me since the jam was not giving me the proper bolt/case head interface. [ATTACH type="full"]466288[/ATTACH] Hornady COW, Hornady 70gr 780, Peterson 70gr 780, Peterson loaded with false shoulder and .020 jam. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Fireforming help needed
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