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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrels, which manufacturer??
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<blockquote data-quote="Pdvdh" data-source="post: 1345897" data-attributes="member: 4191"><p>The first and primary oops was the barrel manufacturer's failure to button rifle a 10-twist barrel.</p><p>Secondary oops is gunsmith doesn't measure twist rate prior to mating barrel to action.</p><p>Third oops is 3yrs after I've received rifle and I'm developing a load without success. Bullet requires a minimum 10-twist. I measure my twist rate multiple times over two full revolutions. 10.55 twist.</p><p>I ask gunsmith about barrel. He checks barrel order invoice and confirms 10 twist was ordered. Informs me that button rifling twist rates are not precisely controlled. Tolerances are less than cut rifled. Could be faster or slower than specified.</p><p>I research the subject and confirm that fact, although 5% error is beyond typical variation.</p><p>You ask HOW did this happen? I already stated smith did not verify twist rate prior to shipping me the completed rifle. Only the individual that rifled the barrel blank could possibly provide the answer to your question. Clearly the barrel manufacturer either didn't confirm the manufactured twist rate, or measured it and decided it was close enough, or thought the odds of anyone measuring the twist rate and making an issue about it were so low - he shipped the barrel to my gunsmith.</p><p></p><p>What makes one better than the other?</p><p></p><p>The barrel with the correct twist rate is the better one. Which rifling method provides the more accurate twist rate during manufacture? Cut-rifled.</p><p></p><p>What happens when your button rifled barrel is delivered with a twist rate 5% slower than the twist rate ordered? You're informed that button rifling of barrels is an imprecise method of controlling twist rate.</p><p></p><p>And then you're faced with the reality that it is what it is...</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1345897, member: 4191"] The first and primary oops was the barrel manufacturer's failure to button rifle a 10-twist barrel. Secondary oops is gunsmith doesn't measure twist rate prior to mating barrel to action. Third oops is 3yrs after I've received rifle and I'm developing a load without success. Bullet requires a minimum 10-twist. I measure my twist rate multiple times over two full revolutions. 10.55 twist. I ask gunsmith about barrel. He checks barrel order invoice and confirms 10 twist was ordered. Informs me that button rifling twist rates are not precisely controlled. Tolerances are less than cut rifled. Could be faster or slower than specified. I research the subject and confirm that fact, although 5% error is beyond typical variation. You ask HOW did this happen? I already stated smith did not verify twist rate prior to shipping me the completed rifle. Only the individual that rifled the barrel blank could possibly provide the answer to your question. Clearly the barrel manufacturer either didn't confirm the manufactured twist rate, or measured it and decided it was close enough, or thought the odds of anyone measuring the twist rate and making an issue about it were so low - he shipped the barrel to my gunsmith. What makes one better than the other? The barrel with the correct twist rate is the better one. Which rifling method provides the more accurate twist rate during manufacture? Cut-rifled. What happens when your button rifled barrel is delivered with a twist rate 5% slower than the twist rate ordered? You're informed that button rifling of barrels is an imprecise method of controlling twist rate. And then you're faced with the reality that it is what it is... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrels, which manufacturer??
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