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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
260 to 6.5-284 - is it worth it???
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<blockquote data-quote="Trickymissfit" data-source="post: 963661" data-attributes="member: 25383"><p>Mike, I pretty much used book numbers that I knew were fairly accurate (forget Hornaday and Sierra). Then I cross referenced for actual chamber pressures where quoted. I know a couple guys that are saying they are seeing a tick under 3100fps from the 6.5-06 with a 140 grain bullet. I don't doubt it, but also have no idea what kind of chamber pressure they are shooting at. With the .260, I think 2800fps is realistic and still safe. Yet most books call out sub 2700fps specs. Accurate does post the chamber pressure specs. Accurate says that a chamber pressure of 60K psi (considered max by SAMMI) will get you about 2740fps with 43 grains of AA4350. Now on the otherhand the 6.5x57 (necked up Roberts case) will do an honest 2730 fps (H4831 with no chamber pressure spec). Guys over on Accurate Shooter are seeing 2950fps with a .257AI case necked up to 6.5. I'd think these specs are real. There are actually two different reamers they are using from Dave Kiff, but are still very close dimensionally. I can't testify about barrel life for sure on the .260, although I'm getting ready to order in one, and possibly two. One will be rechambered to 6.5x57 improved with a 30 degree neck. Twist rate and throat are still up in there air right now. It's also quite possible that I may negate the .260 for a 6.5x47 instead.</p><p> </p><p>Now back to the big fat cases. I know guys are getting well over 3200fps with the .270WSM cased necked down to 6.5, and have heard some crazy numbers from a necked up 25WSM to 6.5 case. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 963661, member: 25383"] Mike, I pretty much used book numbers that I knew were fairly accurate (forget Hornaday and Sierra). Then I cross referenced for actual chamber pressures where quoted. I know a couple guys that are saying they are seeing a tick under 3100fps from the 6.5-06 with a 140 grain bullet. I don't doubt it, but also have no idea what kind of chamber pressure they are shooting at. With the .260, I think 2800fps is realistic and still safe. Yet most books call out sub 2700fps specs. Accurate does post the chamber pressure specs. Accurate says that a chamber pressure of 60K psi (considered max by SAMMI) will get you about 2740fps with 43 grains of AA4350. Now on the otherhand the 6.5x57 (necked up Roberts case) will do an honest 2730 fps (H4831 with no chamber pressure spec). Guys over on Accurate Shooter are seeing 2950fps with a .257AI case necked up to 6.5. I'd think these specs are real. There are actually two different reamers they are using from Dave Kiff, but are still very close dimensionally. I can't testify about barrel life for sure on the .260, although I'm getting ready to order in one, and possibly two. One will be rechambered to 6.5x57 improved with a 30 degree neck. Twist rate and throat are still up in there air right now. It's also quite possible that I may negate the .260 for a 6.5x47 instead. Now back to the big fat cases. I know guys are getting well over 3200fps with the .270WSM cased necked down to 6.5, and have heard some crazy numbers from a necked up 25WSM to 6.5 case. gary [/QUOTE]
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260 to 6.5-284 - is it worth it???
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