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Rifles, Reloading, Optics, Equipment
Gunsmithing
Tight then loose bore
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<blockquote data-quote="drbill" data-source="post: 1112732" data-attributes="member: 11198"><p>Yes its a factory barrel. Winchester model 70. He had me do a OCW test on it before slugging it and the best groups were 1.5" and most alot worse. He was never able to produce groups any better. The bore is actually tight in just the first 2 inches past the throat. I bumped up a slug in the middle of the barrel and at the tight spot. The "measured" difference between the slugs is 0.00025. When you pass the slug muzzle to chamber I cant physically get the slug through those first 2" without the use of a brass hammer...</p></blockquote><p></p>
[QUOTE="drbill, post: 1112732, member: 11198"] Yes its a factory barrel. Winchester model 70. He had me do a OCW test on it before slugging it and the best groups were 1.5" and most alot worse. He was never able to produce groups any better. The bore is actually tight in just the first 2 inches past the throat. I bumped up a slug in the middle of the barrel and at the tight spot. The "measured" difference between the slugs is 0.00025. When you pass the slug muzzle to chamber I cant physically get the slug through those first 2" without the use of a brass hammer... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Tight then loose bore
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