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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 PRC question VS 264win.
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<blockquote data-quote="codyadams" data-source="post: 2431553" data-attributes="member: 87243"><p>I put together a 26" Krieger barreled .264 win mag built on a ruger M77 that was originally a 300 win mag, for my father. It is a 7.5 twist, with a SAAMI chamber. We are running the conservative/accuracy load of an HBN coated 156 EOL @ 3080 fps with 66.5 grains of Retumbo in ADG 7 mag brass. Pressure signs just started to show up at 69.0 grains, in the form of a very faint ejector mark outline on each of 3 rounds fired, going an average of 3222 fps. These are all at .020" off the lands. There was a second best load at 68.5 / 3180 fps, but it was a consistent ~.75 MOA load, where the 3080 load ranges from the .2's to .4's depending on how good the shooter does. At that conservative of a load, I suspect the barrel and brass will last quite a while. It has taken pronghorn and deer out to 850 so far. I have not loaded for a 6.5 prc, so I can't tell you what it will do, but from referencing others numbers, it is nowhere close at similar pressures. Neither is a 6.5-06. </p><p></p><p>As far as your 9 twist, I would either just replace the barrel with a 7-8 twist tube depending on the bullet you want to run, or pick something in the 130 range until you torch the tube. It certainly will run a 140 class bullet, and that may be a decent option if you live at a pretty high elevation like me (6k+) however if your lower elevation, I would be concerned about terminal performance issues when a bullet isn't properly stabilized. Just because it shoots accurate, does not mean it will perform properly.</p></blockquote><p></p>
[QUOTE="codyadams, post: 2431553, member: 87243"] I put together a 26" Krieger barreled .264 win mag built on a ruger M77 that was originally a 300 win mag, for my father. It is a 7.5 twist, with a SAAMI chamber. We are running the conservative/accuracy load of an HBN coated 156 EOL @ 3080 fps with 66.5 grains of Retumbo in ADG 7 mag brass. Pressure signs just started to show up at 69.0 grains, in the form of a very faint ejector mark outline on each of 3 rounds fired, going an average of 3222 fps. These are all at .020" off the lands. There was a second best load at 68.5 / 3180 fps, but it was a consistent ~.75 MOA load, where the 3080 load ranges from the .2's to .4's depending on how good the shooter does. At that conservative of a load, I suspect the barrel and brass will last quite a while. It has taken pronghorn and deer out to 850 so far. I have not loaded for a 6.5 prc, so I can't tell you what it will do, but from referencing others numbers, it is nowhere close at similar pressures. Neither is a 6.5-06. As far as your 9 twist, I would either just replace the barrel with a 7-8 twist tube depending on the bullet you want to run, or pick something in the 130 range until you torch the tube. It certainly will run a 140 class bullet, and that may be a decent option if you live at a pretty high elevation like me (6k+) however if your lower elevation, I would be concerned about terminal performance issues when a bullet isn't properly stabilized. Just because it shoots accurate, does not mean it will perform properly. [/QUOTE]
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6.5 PRC question VS 264win.
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