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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: 1398865" data-attributes="member: 4191"><p>Most cartridges measured 2.602" - 2.605". That's no typo! Some cases lost no case length. Only two of 19 cases lost more than 0.005", with the maximum reduction on those being ~ 0.007". </p><p></p><p>There's a lengthy explanation involved on how I minimize case length shrinkage during COW fire forming. "elkaholic" and I discussed my method on the phone for a good while this past Monday. He was experiencing up to 0.045" loss of overall case length copying my method with other lubricants. We think the difference is the super slick oil I use, which Rich didn't have available for use.</p><p></p><p>Here's a link to a Thread I created two months ago wherein I shared my improved COW fire forming methods. I think the case lubricant I use was identified in that Thread. I now have additional positive experiences COW fire forming brass. Enough to state with extreme confidence, that lubing the casings prior to COW fire forming is a tremendous advantage. Here's the link to that thread:</p><p><a href="https://www.longrangehunting.com/threads/a-i-fire-forming-tip-of-the-day.194793/" target="_blank">https://www.longrangehunting.com/threads/a-i-fire-forming-tip-of-the-day.194793/</a></p><p></p><p>If you're planning to COW fire form some brass soon, and want to get the process from the horse's mouth (me) after reading that Thread, send me a PM with your phone number and I can further share my experience. I just received another 20 RWS 8x68S casings yesterday, so I'll be COW fire forming again soon. Possibly this weekend. This will either cast my success 100% in concrete, or... otherwise. But I expect the same results - very minimal loss in case length during COW fire forming, and much better (fully formed shoulders) formed cases at lower COW fire form case pressure. </p><p></p><p>At 2.605" case length prior to COW fire forming, the case neck contacts the 'step-down' shoulder in my chamber. This is where the chamber transitions from case neck diameter into the 'lead' section that's in contact with the bearing surface of the seated bullets. In my chamber, that transition goes from 0.337" down to 0.3085". So, there is one additional case prep step that the center case in the above photo doesn't show. Before I could chamber the 2.605" length case, I had to cone the leading nose of the case neck inward with a 7mm RM Body Die. Then the case neck would clear the 'step-down' shoulder and I could close the bolt on the prepped cases. After fire forming, the end of the case neck remained coned inward - conformed to the 'step-down' shoulder in my chamber. I expected more case shrinkage, but experienced hardly any. So I then trimmed the cases to final length, which removed that cone on the nose end of the case necks. Enough information... for now...</p><p></p><p>Not sure how many have the interest. PM if you want additional detail! Beyond what's been provided here and in the Thread linked above. Cheers!</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1398865, member: 4191"] Most cartridges measured 2.602" - 2.605". That's no typo! Some cases lost no case length. Only two of 19 cases lost more than 0.005", with the maximum reduction on those being ~ 0.007". There's a lengthy explanation involved on how I minimize case length shrinkage during COW fire forming. "elkaholic" and I discussed my method on the phone for a good while this past Monday. He was experiencing up to 0.045" loss of overall case length copying my method with other lubricants. We think the difference is the super slick oil I use, which Rich didn't have available for use. Here's a link to a Thread I created two months ago wherein I shared my improved COW fire forming methods. I think the case lubricant I use was identified in that Thread. I now have additional positive experiences COW fire forming brass. Enough to state with extreme confidence, that lubing the casings prior to COW fire forming is a tremendous advantage. Here's the link to that thread: [URL]https://www.longrangehunting.com/threads/a-i-fire-forming-tip-of-the-day.194793/[/URL] If you're planning to COW fire form some brass soon, and want to get the process from the horse's mouth (me) after reading that Thread, send me a PM with your phone number and I can further share my experience. I just received another 20 RWS 8x68S casings yesterday, so I'll be COW fire forming again soon. Possibly this weekend. This will either cast my success 100% in concrete, or... otherwise. But I expect the same results - very minimal loss in case length during COW fire forming, and much better (fully formed shoulders) formed cases at lower COW fire form case pressure. At 2.605" case length prior to COW fire forming, the case neck contacts the 'step-down' shoulder in my chamber. This is where the chamber transitions from case neck diameter into the 'lead' section that's in contact with the bearing surface of the seated bullets. In my chamber, that transition goes from 0.337" down to 0.3085". So, there is one additional case prep step that the center case in the above photo doesn't show. Before I could chamber the 2.605" length case, I had to cone the leading nose of the case neck inward with a 7mm RM Body Die. Then the case neck would clear the 'step-down' shoulder and I could close the bolt on the prepped cases. After fire forming, the end of the case neck remained coned inward - conformed to the 'step-down' shoulder in my chamber. I expected more case shrinkage, but experienced hardly any. So I then trimmed the cases to final length, which removed that cone on the nose end of the case necks. Enough information... for now... Not sure how many have the interest. PM if you want additional detail! Beyond what's been provided here and in the Thread linked above. Cheers! [/QUOTE]
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Blew a Primer _ Analysis
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