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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
School me on case design..
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<blockquote data-quote="Trickymissfit" data-source="post: 619222" data-attributes="member: 25383"><p>*6BR will push a 105 grain bullet to just about 3100 fps according to one guy in P.S. I suspect he's also hitting close to the 75K psi mark. My guess is that 2800fps is a very hot load</p><p> </p><p>* a 6xc will do about 2850fps safely, but still a max load.</p><p> </p><p>* my 6/250AI (similar to the 6xc but improved) will touch the 3100 fps mark, but the loads are also pretty hot. 3000fps is much better</p><p> </p><p>* a .243 should be about the same as the 6/250AI as cases capacity is similar, but for some odd ball reason the 250 case seems to be more efficient. The 6XC, 6/250, 6/250AI, .243, .243AI all suffer from too short of a neck length unless the throat is pretty long. What happens is that the bullet base ends up being seated into the shoulder area, and you thus loose capacity</p><p> </p><p>*6mm Remington has a much longer neck length, and the bullet will not be seated into the shoulder. The books list the 6mm remington at about 100fps faster, but that's crap. The round is much closer to 175fps. Ackley said that the 6x57 case was about all the 6mm bullet could handle without going into an overbore condition. A close look at loading manuals will tell us that he was very right. A 6mmAI is really only about 150fps faster than the generic 6mm round. </p><p> </p><p>* then there is the 6BG. This little round is like a 6BR on steriods! It will push a 105 grain bullet to almost 3000fps and still be very safe. Has a .35" long neck with a 30 degree shoulder. Barrels should last a long time, and you won't use nearly as much powder to go just as fast. Plus it's a very tight grouping round like the 6BR.</p><p>glt</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 619222, member: 25383"] *6BR will push a 105 grain bullet to just about 3100 fps according to one guy in P.S. I suspect he's also hitting close to the 75K psi mark. My guess is that 2800fps is a very hot load * a 6xc will do about 2850fps safely, but still a max load. * my 6/250AI (similar to the 6xc but improved) will touch the 3100 fps mark, but the loads are also pretty hot. 3000fps is much better * a .243 should be about the same as the 6/250AI as cases capacity is similar, but for some odd ball reason the 250 case seems to be more efficient. The 6XC, 6/250, 6/250AI, .243, .243AI all suffer from too short of a neck length unless the throat is pretty long. What happens is that the bullet base ends up being seated into the shoulder area, and you thus loose capacity *6mm Remington has a much longer neck length, and the bullet will not be seated into the shoulder. The books list the 6mm remington at about 100fps faster, but that's crap. The round is much closer to 175fps. Ackley said that the 6x57 case was about all the 6mm bullet could handle without going into an overbore condition. A close look at loading manuals will tell us that he was very right. A 6mmAI is really only about 150fps faster than the generic 6mm round. * then there is the 6BG. This little round is like a 6BR on steriods! It will push a 105 grain bullet to almost 3000fps and still be very safe. Has a .35" long neck with a 30 degree shoulder. Barrels should last a long time, and you won't use nearly as much powder to go just as fast. Plus it's a very tight grouping round like the 6BR. glt [/QUOTE]
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