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Rifles, Reloading, Optics, Equipment
Reloading
Bullet touching lands reloading question
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<blockquote data-quote="MagnumManiac" data-source="post: 1446026" data-attributes="member: 10755"><p>This sounds like an overly long chamber.</p><p>I have a few improved chambers including the 22-250AI, if you put a NEW UNFIRED piece of brass in your chamber, you should feel some resistance on bolt close as the handle drops. If you feel NO RESISTANCE on bolt close, then your chamber DOES NOT have the required .005" NEGATIVE HEADSPACE.</p><p>The only remedy for this is to use a fast pistol powder, COW (cream of wheat) and a plug of toilet paper and fire form. This allows brass expansion to the chamber WITHOUT any case stretch, then you will have to neck size until cases become difficult to chamber, then partial FL size to just allow easy chambering again.</p><p>My first AI rifle, a 257 BobAI, had the same issue, it did not have negative headspace and brass would separate on the first or second firing. When I fireformed with COW, the problem disappeared, but I then pulled the barrel, cut off one thread and re-cut the chamber correctly. I discovered my 'smith used a go-gauge to set headspace, which is wrong on an AI chamber.</p><p></p><p>Cheers.</p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1446026, member: 10755"] This sounds like an overly long chamber. I have a few improved chambers including the 22-250AI, if you put a NEW UNFIRED piece of brass in your chamber, you should feel some resistance on bolt close as the handle drops. If you feel NO RESISTANCE on bolt close, then your chamber DOES NOT have the required .005” NEGATIVE HEADSPACE. The only remedy for this is to use a fast pistol powder, COW (cream of wheat) and a plug of toilet paper and fire form. This allows brass expansion to the chamber WITHOUT any case stretch, then you will have to neck size until cases become difficult to chamber, then partial FL size to just allow easy chambering again. My first AI rifle, a 257 BobAI, had the same issue, it did not have negative headspace and brass would separate on the first or second firing. When I fireformed with COW, the problem disappeared, but I then pulled the barrel, cut off one thread and re-cut the chamber correctly. I discovered my ‘smith used a go-gauge to set headspace, which is wrong on an AI chamber. Cheers. :) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Bullet touching lands reloading question
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