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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Brux vs ace barrels
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<blockquote data-quote="Mike D Texas" data-source="post: 3018904" data-attributes="member: 71221"><p>I have a Brux barrel on my 260AI and am currently having another chambered for my 257 Wby with a 7.5 twist. </p><p></p><p>I don't have an ACE barrel yet but am looking at them for a 22-250AI (rebarrel) or 22CM (to replace the 22-250AI. I see they offer 4 groove and 6 groove barrel and my question is, I'm thinking of going to a 6.5 twist for whichever above I go with. Currently my 22-250AI is shooting the 90 grain A-Tip at just over 3300fps in a 25" barrel; it is a Bartlein 5R 7 twist barrel. My calculation show that to have a bullet RPM of 339,428. So far I haven't seen evidence of bullets coming apart. I also plan to try 88 grain ELDMs. Quickload predicts they will run around 3350. </p><p></p><p>Assuming that the ACE barrel runs similar velocities (it will be 1" longer) that has RPMs approaching 365,500 rpm or even higher with the ELDM. </p><p></p><p>So which would be easier on jackets, 4 groove or 6 groove? I've always run 5R rifling because allegedly they are less stressful on thin bullet jackets. </p><p></p><p>Any thoughts?</p></blockquote><p></p>
[QUOTE="Mike D Texas, post: 3018904, member: 71221"] I have a Brux barrel on my 260AI and am currently having another chambered for my 257 Wby with a 7.5 twist. I don’t have an ACE barrel yet but am looking at them for a 22-250AI (rebarrel) or 22CM (to replace the 22-250AI. I see they offer 4 groove and 6 groove barrel and my question is, I’m thinking of going to a 6.5 twist for whichever above I go with. Currently my 22-250AI is shooting the 90 grain A-Tip at just over 3300fps in a 25” barrel; it is a Bartlein 5R 7 twist barrel. My calculation show that to have a bullet RPM of 339,428. So far I haven’t seen evidence of bullets coming apart. I also plan to try 88 grain ELDMs. Quickload predicts they will run around 3350. Assuming that the ACE barrel runs similar velocities (it will be 1” longer) that has RPMs approaching 365,500 rpm or even higher with the ELDM. So which would be easier on jackets, 4 groove or 6 groove? I’ve always run 5R rifling because allegedly they are less stressful on thin bullet jackets. Any thoughts? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Brux vs ace barrels
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