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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
M70 .300 Wby Mag throws bullets
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<blockquote data-quote="Magnum76" data-source="post: 768098" data-attributes="member: 54167"><p>I'm asking this question for a friend.</p><p></p><p>He has a Winchester Model 70 in .300 Wby Mag. 28" inch barrel, stainless, not sure on twist, 6 groove. After market barrel (Hart?)</p><p></p><p>Handloads, I forget what powder he's using but 88gr rings a bell for a certain weight bullet.</p><p></p><p>At 100 yds any weight bullet doesn't change POI. (crazy... lucky bastard)</p><p></p><p>Will cloverleaf three rounds if you do your part, @100yds.</p><p></p><p>After about 5-10 rounds it starts stringing the groups open. To the point of being unacceptable for accuracy purposes. Say about 3" groups. Barrel is given time to cool in between shots.</p><p></p><p>If the bore is cleaned, accuracy returns.</p><p></p><p>Does anyone know why the groups open up in a string pattern after a few rounds?</p><p></p><p>Is this crazy long barrel that subject to fouling?</p><p></p><p>Muzzle crown is fine.</p><p></p><p>Completely open to ideas and/or suggestions</p></blockquote><p></p>
[QUOTE="Magnum76, post: 768098, member: 54167"] I'm asking this question for a friend. He has a Winchester Model 70 in .300 Wby Mag. 28" inch barrel, stainless, not sure on twist, 6 groove. After market barrel (Hart?) Handloads, I forget what powder he's using but 88gr rings a bell for a certain weight bullet. At 100 yds any weight bullet doesn't change POI. (crazy... lucky bastard) Will cloverleaf three rounds if you do your part, @100yds. After about 5-10 rounds it starts stringing the groups open. To the point of being unacceptable for accuracy purposes. Say about 3" groups. Barrel is given time to cool in between shots. If the bore is cleaned, accuracy returns. Does anyone know why the groups open up in a string pattern after a few rounds? Is this crazy long barrel that subject to fouling? Muzzle crown is fine. Completely open to ideas and/or suggestions [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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M70 .300 Wby Mag throws bullets
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