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Hunting
Long Range Hunting & Shooting
260 Rem Vs. 6.5-06
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<blockquote data-quote="Trickymissfit" data-source="post: 529245" data-attributes="member: 25383"><p>what I'm saying is that it's common knowledge that the 6.5AI will do an honest 3100+ fps without getting into the 75K psi range. The .260 is about maxed out with a 140 grain bullet at 2750 fps, and there's no way your going to gain nearly 400 fps by blowing the shoulder out to 40 degrees and opening up the body about .005" without going to 75Kpsi. There's not a lot of body taper in the .260 anyway (.015"), so all the powder gains will be in the shoulder. yet with the longer 6.5 bullets you'll loose that when you push the bullet back into the shoulder due to the short neck. But looking at the 57mm Mauser case, it has .037" taper built into it. Then taking the .010" Ackley standard taper you'll gain about .025" in volume by blowing the case out, plus what you gain from blowing the shoulder out from 18 degrees to 40 degrees with a neck that will come out at roughly .260" in length after fire forming (still too short). After fire forming the .260AI (he never did that round by the way) you'll see a neck length of about .24", which is way too short unless you start out with 6.5x55 brass and cut it long.</p><p> </p><p>be safe</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 529245, member: 25383"] what I'm saying is that it's common knowledge that the 6.5AI will do an honest 3100+ fps without getting into the 75K psi range. The .260 is about maxed out with a 140 grain bullet at 2750 fps, and there's no way your going to gain nearly 400 fps by blowing the shoulder out to 40 degrees and opening up the body about .005" without going to 75Kpsi. There's not a lot of body taper in the .260 anyway (.015"), so all the powder gains will be in the shoulder. yet with the longer 6.5 bullets you'll loose that when you push the bullet back into the shoulder due to the short neck. But looking at the 57mm Mauser case, it has .037" taper built into it. Then taking the .010" Ackley standard taper you'll gain about .025" in volume by blowing the case out, plus what you gain from blowing the shoulder out from 18 degrees to 40 degrees with a neck that will come out at roughly .260" in length after fire forming (still too short). After fire forming the .260AI (he never did that round by the way) you'll see a neck length of about .24", which is way too short unless you start out with 6.5x55 brass and cut it long. be safe gary [/QUOTE]
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260 Rem Vs. 6.5-06
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