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Rifles, Reloading, Optics, Equipment
Reloading
.22-250
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<blockquote data-quote="brianwinzor" data-source="post: 132279" data-attributes="member: 1067"><p>northernchris, If it is genuinely a 1 in 14 twist barrel then it has no chance of stabilising in your 22/250.</p><p></p><p>About 20 years ago, when the Hornady 68 grain HPBT, and Sierra 69 grain HPBT became available in Oz, I built up a .220 Swift AI. I took my gunsmith's advice, and chose a 1 in 12 twist barrel, but despite reaching 3,700 fps, every projectile keyholed into the 100 yard target. </p><p></p><p>So a 69 grain Sierra at about 3,250 fps out of a 22/250 with a 1 in 14 twist barrel has no chance whatsoever.</p><p></p><p>I have used the 69 grain Sierra extensively in my 22/250AI with a 1 in 10 twist barrel, and at velocities ranging from about 2,800 fps through to 3,450 fps, there has not been a hint of a keyhole, and accuracy has usually been 0.5moa or better. Hope that is of some help. Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 132279, member: 1067"] northernchris, If it is genuinely a 1 in 14 twist barrel then it has no chance of stabilising in your 22/250. About 20 years ago, when the Hornady 68 grain HPBT, and Sierra 69 grain HPBT became available in Oz, I built up a .220 Swift AI. I took my gunsmith's advice, and chose a 1 in 12 twist barrel, but despite reaching 3,700 fps, every projectile keyholed into the 100 yard target. So a 69 grain Sierra at about 3,250 fps out of a 22/250 with a 1 in 14 twist barrel has no chance whatsoever. I have used the 69 grain Sierra extensively in my 22/250AI with a 1 in 10 twist barrel, and at velocities ranging from about 2,800 fps through to 3,450 fps, there has not been a hint of a keyhole, and accuracy has usually been 0.5moa or better. Hope that is of some help. Brian. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
.22-250
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