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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Re-chamber for 7RM Question...
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<blockquote data-quote="MagnumManiac" data-source="post: 1546820" data-attributes="member: 10755"><p>I do this on my comp barrels only. I set-back 3 times on a barrel, if I think a 4th will work, I do it and see, but this is hit and miss and the barrel may only last half a season instead of a full season. I also don't clean for 200-300 rounds without accuracy issues.</p><p>These barrels are in 6.5x47, 264WM and 300WM.</p><p>The reason is simply to keep the throat fresh. It's not the haze cracking that 'shoots out' a barrel per se'. It's the throat 'ballooning' that creates the accuracy to drop, a loss in velocity is always accompanied with the accuracy loss. A lot of the time you can increase powder and gain velocity and accuracy back, not always as good as what it was, but you can re-tune.</p><p>I have a barrel that has NO RIFLING AT ALL for 4" from end of chamber, it still shoots sub MoA with the right load.</p><p>The other myth is that the rifling near the muzzle doesn't erode as some think, it is generally rounded by cleaning rods.</p><p>Setting back and re-reaming keeps the throat end square and the transition to the rifling true and at the correct angle.</p><p>The haze cracking is generally not as deep as the new throat is, so it cleans it up almost 100%.</p><p>I have not tried to set-back a burned out barrel. Don't see the point.</p><p></p><p>Hope this answers your question.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1546820, member: 10755"] I do this on my comp barrels only. I set-back 3 times on a barrel, if I think a 4th will work, I do it and see, but this is hit and miss and the barrel may only last half a season instead of a full season. I also don’t clean for 200-300 rounds without accuracy issues. These barrels are in 6.5x47, 264WM and 300WM. The reason is simply to keep the throat fresh. It’s not the haze cracking that ‘shoots out’ a barrel per se’. It’s the throat ‘ballooning’ that creates the accuracy to drop, a loss in velocity is always accompanied with the accuracy loss. A lot of the time you can increase powder and gain velocity and accuracy back, not always as good as what it was, but you can re-tune. I have a barrel that has NO RIFLING AT ALL for 4” from end of chamber, it still shoots sub MoA with the right load. The other myth is that the rifling near the muzzle doesn’t erode as some think, it is generally rounded by cleaning rods. Setting back and re-reaming keeps the throat end square and the transition to the rifling true and at the correct angle. The haze cracking is generally not as deep as the new throat is, so it cleans it up almost 100%. I have not tried to set-back a burned out barrel. Don’t see the point. Hope this answers your question. Cheers. [/QUOTE]
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Re-chamber for 7RM Question...
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