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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
260 barrel length
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<blockquote data-quote="Aubrey" data-source="post: 280768" data-attributes="member: 17222"><p>Interesing topic... I'm contemplating a similar project and am intrigued by the 20" guns. The 20" R700 LTR with the fluted barrel is only 7.5# per the catalog. However, I'm not that intested in a 308 and would prefer a 7mm-08 or 260R for the superior ballistic coefficients.</p><p> </p><p>I did some internal volume calculations to compare the different calibers and found that a 7mm would need something like a 23.6" barrel to have the same internal volume as a .308 20". A 6.5mm would need a 27.3".</p><p> </p><p>Certainly I'm not an internal ballistics expert, and there are certainly other variables than specific volume, but I do believe the larger-bore cartridges for a given case capacity will have an easier time achieving their velocity potential with a shorter barrel than the same case necked down to a smaller bore.</p></blockquote><p></p>
[QUOTE="Aubrey, post: 280768, member: 17222"] Interesing topic... I'm contemplating a similar project and am intrigued by the 20" guns. The 20" R700 LTR with the fluted barrel is only 7.5# per the catalog. However, I'm not that intested in a 308 and would prefer a 7mm-08 or 260R for the superior ballistic coefficients. I did some internal volume calculations to compare the different calibers and found that a 7mm would need something like a 23.6" barrel to have the same internal volume as a .308 20". A 6.5mm would need a 27.3". Certainly I'm not an internal ballistics expert, and there are certainly other variables than specific volume, but I do believe the larger-bore cartridges for a given case capacity will have an easier time achieving their velocity potential with a shorter barrel than the same case necked down to a smaller bore. [/QUOTE]
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