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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
what 6mm
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<blockquote data-quote="Trickymissfit" data-source="post: 787554" data-attributes="member: 25383"><p>a .243 will push a 95 grain bullet right ontop of 3200fps using a 26" barrel. Yet the 6BR with the same bullet will go an honest 2850fps with a 24" barrel. and will probably do over 2900fps with the same barrel. The 6BR was made for a 22" barrel, and we see little gains to be made with the much longer barrels. The 250 case was also designed around the 22" barrel length, but is best with a 24" barrel for a near full powder burn. I use a 26" barrel with the 6/250AI, and honestly think it'd work well with a 24" barrel with the right powder. It will do a slight tick under 3000fps with a 105 grain bullet. So a 95 grain bullet ought to do right at 3100fps. The others have gotten 3100fps out of the same bullet in the 6x47L. That a smaller case, and we learn that it must have a very efficient powder burn like the 6BR. On the otherhand the 6mm INT. (great round) is listed by Sierra at almost 2800fps with the 105 grain bullet. (20" barrel length) I kinda think their loads are somewhat anemic here anyway, and think it has another 100fps in it. The shoulder to base length is 1.39" with an overall length of 1.91". In improved version would be very similar to the 6x47L if I have the drawings right in my head. The Ackley handbook shows two or three improved international cases, and one (or more) of them are said to push a 95 grain bullet to almost 3300fps! Barrel length is unspec'd. The HLS is also similar in velocity</p><p> </p><p>The real serious issue with longer barrels (besides weight) is harmonics. They literally become a tuning fork in an effort to gain another hundred feet per second. Plus it would take a middle line backer to hump that thing a couple miles with a 1" strait contour. Lilja did a test a few years back with his #7 contour barrels. He found that a 21" barrel was 2.75 stiffer than the same contour 26" long. I did my own testing (although rather crude), and pretty confirmed his thoughts. I also got similar results with the Remington #5.5 contour (maybe 2.5 times stiffer) going from 26" to 20" in length. But the test with the Remington barrel cannot be compaired exactly with his test as part of the big end hand been cut off. I would have prefered a 22" barrel, but it just didn't come out that way. The rest of my testing would be considered flawed by any man, as there were too many other things added into the mix to compair the short barrel with the longer in performance, except for velocity. In this case I lost 74fps. (.223 case)</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 787554, member: 25383"] a .243 will push a 95 grain bullet right ontop of 3200fps using a 26" barrel. Yet the 6BR with the same bullet will go an honest 2850fps with a 24" barrel. and will probably do over 2900fps with the same barrel. The 6BR was made for a 22" barrel, and we see little gains to be made with the much longer barrels. The 250 case was also designed around the 22" barrel length, but is best with a 24" barrel for a near full powder burn. I use a 26" barrel with the 6/250AI, and honestly think it'd work well with a 24" barrel with the right powder. It will do a slight tick under 3000fps with a 105 grain bullet. So a 95 grain bullet ought to do right at 3100fps. The others have gotten 3100fps out of the same bullet in the 6x47L. That a smaller case, and we learn that it must have a very efficient powder burn like the 6BR. On the otherhand the 6mm INT. (great round) is listed by Sierra at almost 2800fps with the 105 grain bullet. (20" barrel length) I kinda think their loads are somewhat anemic here anyway, and think it has another 100fps in it. The shoulder to base length is 1.39" with an overall length of 1.91". In improved version would be very similar to the 6x47L if I have the drawings right in my head. The Ackley handbook shows two or three improved international cases, and one (or more) of them are said to push a 95 grain bullet to almost 3300fps! Barrel length is unspec'd. The HLS is also similar in velocity The real serious issue with longer barrels (besides weight) is harmonics. They literally become a tuning fork in an effort to gain another hundred feet per second. Plus it would take a middle line backer to hump that thing a couple miles with a 1" strait contour. Lilja did a test a few years back with his #7 contour barrels. He found that a 21" barrel was 2.75 stiffer than the same contour 26" long. I did my own testing (although rather crude), and pretty confirmed his thoughts. I also got similar results with the Remington #5.5 contour (maybe 2.5 times stiffer) going from 26" to 20" in length. But the test with the Remington barrel cannot be compaired exactly with his test as part of the big end hand been cut off. I would have prefered a 22" barrel, but it just didn't come out that way. The rest of my testing would be considered flawed by any man, as there were too many other things added into the mix to compair the short barrel with the longer in performance, except for velocity. In this case I lost 74fps. (.223 case) gary [/QUOTE]
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