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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6-6.5x47 Lapua Build
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<blockquote data-quote="SBruce" data-source="post: 614393" data-attributes="member: 21068"><p>I am not an expert, but I do have some experience with this cartridge.</p><p> </p><p>My Ackley Improved versions of the 6X47 Lapua shoot the 105 A-Max and 105 Berger with a 9 twist and 8.5 twist very good, but I am at 4100' elevation, and am pushing them anywhere from 2900'/sec to 3100'/sec out of a 26" barrel (hot loads were 3300'/sec). If there's any chance that you might want to use the 115's I agree with an 8 twist or faster. </p><p> </p><p>I don't know that you really <em><u>need</u></em> the 28" barrel length, and I doubt you'll benefit a whole lot from it, that cartridge is extremely efficient. Do whichever you wan't, just saying that I don't believe it's necessary for such an efficient case, it's not like a 6-284 or even the 6.5-284, that <u>really benefit</u> from long barrels. Long barrels also have the reputation for being more "whippy" and I've heard they're more expensive.?</p><p> </p><p>.268 neck means you'll be turning case necks, and you'll be taking alot of brass off. One of mine is a .269 neck and I had to take over .002" off of the virgin cases (minimum just to have fitted necks). Remember, they will thicken after you neck em down to 6mm. </p><p> </p><p>My latest one isn't a tight neck, it's a .273 chamber neck, and leaves .002 clearance on a loaded round without any neck turning. My loaded rounds that haven't been turned are measuring about .271 average diameter. If you wanted a minimum turn gun (so you can turn off uneven neck thickness), you could go with a .270 or .271 neck and then you wouldn't have to take so much brass off.</p><p> </p><p>Personally, I'd rather not turn necks and just sort the cases for neck thickness variances. But that's just me.</p><p> </p><p>Feel free to PM me if you've got any other questions.</p></blockquote><p></p>
[QUOTE="SBruce, post: 614393, member: 21068"] I am not an expert, but I do have some experience with this cartridge. My Ackley Improved versions of the 6X47 Lapua shoot the 105 A-Max and 105 Berger with a 9 twist and 8.5 twist very good, but I am at 4100' elevation, and am pushing them anywhere from 2900'/sec to 3100'/sec out of a 26" barrel (hot loads were 3300'/sec). If there's any chance that you might want to use the 115's I agree with an 8 twist or faster. I don't know that you really [I][U]need[/U][/I] the 28" barrel length, and I doubt you'll benefit a whole lot from it, that cartridge is extremely efficient. Do whichever you wan't, just saying that I don't believe it's necessary for such an efficient case, it's not like a 6-284 or even the 6.5-284, that [U]really benefit[/U] from long barrels. Long barrels also have the reputation for being more "whippy" and I've heard they're more expensive.? .268 neck means you'll be turning case necks, and you'll be taking alot of brass off. One of mine is a .269 neck and I had to take over .002" off of the virgin cases (minimum just to have fitted necks). Remember, they will thicken after you neck em down to 6mm. My latest one isn't a tight neck, it's a .273 chamber neck, and leaves .002 clearance on a loaded round without any neck turning. My loaded rounds that haven't been turned are measuring about .271 average diameter. If you wanted a minimum turn gun (so you can turn off uneven neck thickness), you could go with a .270 or .271 neck and then you wouldn't have to take so much brass off. Personally, I'd rather not turn necks and just sort the cases for neck thickness variances. But that's just me. Feel free to PM me if you've got any other questions. [/QUOTE]
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6-6.5x47 Lapua Build
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