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Long Range Hunting & Shooting
22 Creedmoor/ 22-250AI owners - help!
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<blockquote data-quote="charlesasmith" data-source="post: 2268763" data-attributes="member: 15461"><p>I shot 50 gr Nos BT @ 4,000 fps jamed using Win 760 in my 22-250 AI. However, my groups opened up eventually. I discovered that the throat eroded 0.053." Probably shot 1,000 rounds through it. It used to be extremely accurate. Now am testing with 55 gr bullets with long shanks for seating at or into the lands loads with 760 and 2700. Unfortunately, it is a 14 twist barrel, so cannot use 53 gr V-Max bullets.</p><p></p><p>I recommend going with a zero freebore for this cartridge when shooting 50-55 gr bullets to compensate for future throat erosion. If I were to do this from scratch, I would go with a 1-11 twist to ensure stability with the 53 gr V-Max bullet. I have no experience with heavier bullets that may or not provide rapid expansion.</p><p></p><p>Chuck</p></blockquote><p></p>
[QUOTE="charlesasmith, post: 2268763, member: 15461"] I shot 50 gr Nos BT @ 4,000 fps jamed using Win 760 in my 22-250 AI. However, my groups opened up eventually. I discovered that the throat eroded 0.053." Probably shot 1,000 rounds through it. It used to be extremely accurate. Now am testing with 55 gr bullets with long shanks for seating at or into the lands loads with 760 and 2700. Unfortunately, it is a 14 twist barrel, so cannot use 53 gr V-Max bullets. I recommend going with a zero freebore for this cartridge when shooting 50-55 gr bullets to compensate for future throat erosion. If I were to do this from scratch, I would go with a 1-11 twist to ensure stability with the 53 gr V-Max bullet. I have no experience with heavier bullets that may or not provide rapid expansion. Chuck [/QUOTE]
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