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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Set back - concerns
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<blockquote data-quote="Fitch" data-source="post: 512975" data-attributes="member: 19372"><p>If the barrel was originally a .220 Swift that was shot out, 1/2" setback won't do much good. The significant throat erosion, which comes from thermal shock fatigue, will extend up the barrel a good 1-1/2" or more from the throat. </p><p> </p><p>When I set back my .22-250 I had to cut off the whole old chamber to get the new throat past the errosion.</p><p> </p><p>On that basis, I'd take a look in it with a borescope. Examine the throat and crown. If the throat looks like a dry lake bed past where the new leads end, I'd send it back. If it doesn't, I'd install it, carefully head space it and check with both go and no-go gages, and see how it shoots.</p><p> </p><p>Fitch</p></blockquote><p></p>
[QUOTE="Fitch, post: 512975, member: 19372"] If the barrel was originally a .220 Swift that was shot out, 1/2" setback won't do much good. The significant throat erosion, which comes from thermal shock fatigue, will extend up the barrel a good 1-1/2" or more from the throat. When I set back my .22-250 I had to cut off the whole old chamber to get the new throat past the errosion. On that basis, I'd take a look in it with a borescope. Examine the throat and crown. If the throat looks like a dry lake bed past where the new leads end, I'd send it back. If it doesn't, I'd install it, carefully head space it and check with both go and no-go gages, and see how it shoots. Fitch [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Barrel Set back - concerns
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