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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel length and velocity question
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<blockquote data-quote="Trickymissfit" data-source="post: 832376" data-attributes="member: 25383"><p>like Mike said case volume verses barrel length is the key factor here. A 6mm Remington is probably about done in a 26" barrel, but with a powder burn rate adjustment, it will shoot similar velocities in a 24" barrel. An example here is with H414. I can see little difference between the two using something like an 80 grain bullet. Yet I think moving up to a 105 grain bullet will show some difference. With my 6/250 improved, I doubt there's much difference between a 24" barrel and a 26" or even a 28" barrel. I know for a fact that I lost about 75 fps going from a 26" barrel to a 20" barrel in a .223. I'd also say a 22-250 is similar in that we normally think of them with a 26" barrel shooting 50 thru 55 grain bullets, but probably very little difference with a 24" barrel. yet the same round in a fast twist barrel might show more gain using 75 grain bullets verses the samething in a 24" tube. When we start moving into the .277 and larger bullets the advantage of a longer barrel often comes to the front as they also often have much greater case volume. But if you took a .250 Savage case and necked it up to 7mm, and compared it to a .280; you'd find a need for the longer barrel length. The .250/7mm probably would do nicely with a 23" tube.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 832376, member: 25383"] like Mike said case volume verses barrel length is the key factor here. A 6mm Remington is probably about done in a 26" barrel, but with a powder burn rate adjustment, it will shoot similar velocities in a 24" barrel. An example here is with H414. I can see little difference between the two using something like an 80 grain bullet. Yet I think moving up to a 105 grain bullet will show some difference. With my 6/250 improved, I doubt there's much difference between a 24" barrel and a 26" or even a 28" barrel. I know for a fact that I lost about 75 fps going from a 26" barrel to a 20" barrel in a .223. I'd also say a 22-250 is similar in that we normally think of them with a 26" barrel shooting 50 thru 55 grain bullets, but probably very little difference with a 24" barrel. yet the same round in a fast twist barrel might show more gain using 75 grain bullets verses the samething in a 24" tube. When we start moving into the .277 and larger bullets the advantage of a longer barrel often comes to the front as they also often have much greater case volume. But if you took a .250 Savage case and necked it up to 7mm, and compared it to a .280; you'd find a need for the longer barrel length. The .250/7mm probably would do nicely with a 23" tube. gary [/QUOTE]
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Barrel length and velocity question
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