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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Is the 6mmXC all that it's made out to be.
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<blockquote data-quote="Trickymissfit" data-source="post: 744349" data-attributes="member: 25383"><p>I shoot an improved 6/250. Similar but improved . It'll push a 105 grain Amax at 3000 fps without going into over pressure, but would still consider it to be about as close to max as I wanta be. The 6XC is really nothing but a necked up 22-250, or a necked down .250 Savage case. the 6XC and the .243 both have similar issues, and the improved versions only marginally help fix the issues. They both show a neck length that's very close to .250", but you will find that it often comes out a little shorter than that. If you do the improved case, expect a neck length to finish out at about .230". The 6XC will be better in the case shrinkage department, as there should be very little. The shoulder angle is not so hot on either round. I planning on a 1200 round throat life in my barrel; which is far greater than a .243. But sorta lackluster compaired to a 6BR that will easilly go 2500 rounds.</p><p> </p><p>I know two or three guys that have been shooting the 6XC (or it's clones) over the last fifteen years or so. Most are shooting bullets in the 75 to 85 grain range. I think they are getting around 3250 fps with 80 grain bullets. That's pretty close to a .243. But a 6BR will also push an 80 grain bullet to about 3100 fps! With a lot less powder. I use .243 cases to form the 6/250AI, and I do this to get better cases with less case shrinkage ( you won't worry too much about that). But when this barrel finally goes south I'll rechamber it in 6BG. Very similar to the 6/250AI, but with a longer neck and a 30 dregree shoulder. The shoulder comes in at 1.552" verses the 1.514 of the 250 case.. I think I do all this with about a 1/8" set back and still clean up the throat damage (if not I'll go .25") The over all length will finish out right at what the standard .243 case length is, but with a .35" neck. But I'm tempted to ream the head space a little short to come in with a 1.48" shoulder length instead of 1.552". In otherwords a 6mm Int. on steriods with a 2000 round barrel life.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 744349, member: 25383"] I shoot an improved 6/250. Similar but improved . It'll push a 105 grain Amax at 3000 fps without going into over pressure, but would still consider it to be about as close to max as I wanta be. The 6XC is really nothing but a necked up 22-250, or a necked down .250 Savage case. the 6XC and the .243 both have similar issues, and the improved versions only marginally help fix the issues. They both show a neck length that's very close to .250", but you will find that it often comes out a little shorter than that. If you do the improved case, expect a neck length to finish out at about .230". The 6XC will be better in the case shrinkage department, as there should be very little. The shoulder angle is not so hot on either round. I planning on a 1200 round throat life in my barrel; which is far greater than a .243. But sorta lackluster compaired to a 6BR that will easilly go 2500 rounds. I know two or three guys that have been shooting the 6XC (or it's clones) over the last fifteen years or so. Most are shooting bullets in the 75 to 85 grain range. I think they are getting around 3250 fps with 80 grain bullets. That's pretty close to a .243. But a 6BR will also push an 80 grain bullet to about 3100 fps! With a lot less powder. I use .243 cases to form the 6/250AI, and I do this to get better cases with less case shrinkage ( you won't worry too much about that). But when this barrel finally goes south I'll rechamber it in 6BG. Very similar to the 6/250AI, but with a longer neck and a 30 dregree shoulder. The shoulder comes in at 1.552" verses the 1.514 of the 250 case.. I think I do all this with about a 1/8" set back and still clean up the throat damage (if not I'll go .25") The over all length will finish out right at what the standard .243 case length is, but with a .35" neck. But I'm tempted to ream the head space a little short to come in with a 1.48" shoulder length instead of 1.552". In otherwords a 6mm Int. on steriods with a 2000 round barrel life. gary [/QUOTE]
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Is the 6mmXC all that it's made out to be.
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