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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7prc barrel length
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<blockquote data-quote="Mikecr" data-source="post: 2944373" data-attributes="member: 1521"><p>My approach to barrel length is a little more complicated than asking around.</p><p>In QuickLoad, I'll set a 26" barrel to begin, and run powder what ifs -for highest velocity -with 104% load density -at SAAMI max pressure -with a given bullet.</p><p>That gets my powder.</p><p>Then I tweak barrel length for muzzle pressure no higher than 8Kpsi.</p><p>That gets my barrel length.</p><p>For examples, 6XC put me at 27", 6BR/26", 223Rem/24". The magic number for 6PPC is ~22".</p><p></p><p>This is where it all comes into play (in the long run):</p><p>With a 260AI capacity cartridge, my barrel length by this standard comes in at 28".</p><p>This provides a mid node MV of 3025fps, with 140gr bullets, at SAAMI max. There is no animal on Earth that I couldn't kill with this.</p><p>To match it with a 6.5-284, same length barrel, you will burn way more powder and give up ~650rds of accurate barrel life and a lot of brass life to mine.</p><p>Go with a shorter barrel in 6.5-284, and forget getting anything near my 260AI capacity. You won't get the velocities OR the barrel life OR the brass life.</p><p></p><p>You can go smaller capacity, with a barrel length comparable to a suppressed length, and then you shouldn't need a suppressor.</p><p>A lot of things get better as you leave that behind, -but not everything.</p><p>A 28" barreled gun is longer, so it weighs more. You <u>may</u> need to add weight to the butt stock for balance.</p><p>It needs to be planned out (like any other path). Perhaps considering fluting or a carbon wrapped barrel.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2944373, member: 1521"] My approach to barrel length is a little more complicated than asking around. In QuickLoad, I'll set a 26" barrel to begin, and run powder what ifs -for highest velocity -with 104% load density -at SAAMI max pressure -with a given bullet. That gets my powder. Then I tweak barrel length for muzzle pressure no higher than 8Kpsi. That gets my barrel length. For examples, 6XC put me at 27", 6BR/26", 223Rem/24". The magic number for 6PPC is ~22". This is where it all comes into play (in the long run): With a 260AI capacity cartridge, my barrel length by this standard comes in at 28". This provides a mid node MV of 3025fps, with 140gr bullets, at SAAMI max. There is no animal on Earth that I couldn't kill with this. To match it with a 6.5-284, same length barrel, you will burn way more powder and give up ~650rds of accurate barrel life and a lot of brass life to mine. Go with a shorter barrel in 6.5-284, and forget getting anything near my 260AI capacity. You won't get the velocities OR the barrel life OR the brass life. You can go smaller capacity, with a barrel length comparable to a suppressed length, and then you shouldn't need a suppressor. A lot of things get better as you leave that behind, -but not everything. A 28" barreled gun is longer, so it weighs more. You [U]may[/U] need to add weight to the butt stock for balance. It needs to be planned out (like any other path). Perhaps considering fluting or a carbon wrapped barrel. [/QUOTE]
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