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Campfire 'Bwana
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Campfire 'Bwana
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Hmmmmm....that is interesting. So, all else equal, a sharper shoulder and shorter neck = faster barrel burning??
A wise man is frequently humbled.
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Joined: Jul 2001
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Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
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Not necessarily.
Some shoters firmly believe that the reason the .243 Winchester tends to erode barrels more quickly than the 6mm Remington (which could be debated, and no doubt will be) is the .243's more sloping shoulder and short neck. The theory is that the shoulder tends to direct the hot gas into the throat just in front of the neck, speeding up erosion.
One piece of evidence in support of this theory is that Ackley Improving the .243 tends to slow erosion, but you'd have to shoot out a bunch of barrels to come to any firm conclusions.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Campfire Regular
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Campfire Regular
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After talking to the smith who built the 6.5-06 for me and a few other friends/smiths they mostly agreed that if you take the angle of the shoulder draw intersecting lines forward of the shoulder and where those lines intersect is the hottest point of the powder burn sequence. If that point is in the throat area it will induce more wear. If it is in the neck of the case the case itself will take the brunt of the heat. Brass is cheaper than barrels.
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Joined: Jun 2006
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2006
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Ahh, so an Ackley with a long neck is not a bad thing.
A wise man is frequently humbled.
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Campfire Outfitter
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Campfire Outfitter
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Not necessarily.
Some shoters firmly believe that the reason the .243 Winchester tends to erode barrels more quickly than the 6mm Remington (which could be debated, and no doubt will be) is the .243's more sloping shoulder and short neck. The theory is that the shoulder tends to direct the hot gas into the throat just in front of the neck, speeding up erosion.
One piece of evidence in support of this theory is that Ackley Improving the .243 tends to slow erosion, but you'd have to shoot out a bunch of barrels to come to any firm conclusions. IIRC McPherson used this as a reason behind his line of case designs. Something about keeping the turbulence inside the case neck through a combination of shoulder angle and neck length. I also recall reading that this is the reason the 6mm Rem doesn't suffer the same issue as the 243. From the Superior Ballistics website:
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Joined: May 2011
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Campfire Regular
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Campfire Regular
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Yup.. I had a 6mm rem that went over 3000 rounds before it needed set back. I ran that thing HOT!
Theoretically an ackley with a long neck IS a good thing.
Last edited by Cocadori; 12/09/11.
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Campfire Regular
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Just did my final load work up for mine..
settled on RL 22 and the 142 SMK lit by the Fed210M. Running them at 2910fps out of a 26" barrel
5 shot group at 500 meters of 2.4"
since the weather will stay cold and the load work up was done at 30* i'll stick with this until spring.
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Joined: Jun 2006
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2006
Posts: 46,148 Likes: 7 |
A wise man is frequently humbled.
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Campfire Regular
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Yep..I'm pretty tickled!
albeit this isn't a hunting type rig... more of a precision/tactical type.
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Campfire Outfitter
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Just checked mine before my late cow season starts. Shot 3 rounds of 160 Woodleigh into .45" at 10,000 foot elevation. Was 2 clicks higher than my 140 berger load so clicked it down, reset turret and ready to roll.
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Joined: Jun 2006
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2006
Posts: 46,148 Likes: 7 |
A wise man is frequently humbled.
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Posts: 2,437
Campfire Regular
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Campfire Regular
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6.5-06 It is a hammer. 1st load work up with RL 22 and 142 SMK's 500 meters from prone off a bi-pod.
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Joined: Jun 2006
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2006
Posts: 46,148 Likes: 7 |
Man, you need some better targets, you'll never shoot good groups with targetrs like that.......see how the O's are all off to the right?
A wise man is frequently humbled.
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Well it was a tough day shooting. High winds, driving snow, uphill to the target both ways. The hard part was shooting around the hill between me and the target. The skipping off the water was the easier of the tasks. It only gets tricky past 500 meters.
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Just checked mine before my late cow season starts. Shot 3 rounds of 160 Woodleigh into .45" at 10,000 foot elevation. Was 2 clicks higher than my 140 berger load so clicked it down, reset turret and ready to roll. H1000 for the 160's?
Murphy was a grunt.
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Yes sir. RL22 for the 140s and H1000 for the 160s. Still looking for a cow elk to test a 160 on.
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Campfire Regular
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A 6.5-06 ?? I would love to try a 6.5-06 !! I have owned 2 270s and would rather have crabs than to own another one.
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Jan 2007
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A 6.5-06 ?? I would love to try a 6.5-06 !! I have owned 2 270s and would rather have crabs than to own another one. Tell us about your terrible 270 experiences after owning a "whole" two! I can't wait to hear this.... But I'm all ears! I figure if you'd rather have the "crabs" than the 270,you must have considerable experience with both, in order to form such a learned opinion....just thinkin' out loud,of course.
Last edited by BobinNH; 12/28/11.
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Campfire Ranger
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Campfire Ranger
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jwall- *** 3100 guy***
A Flat Trajectory is Never a Handicap
Speed is Trajectory's Friend !!
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Joined: Sep 2010
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Campfire Ranger
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Campfire Ranger
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A 6.5-06 ?? I would love to try a 6.5-06 !! I have owned 2 270s and would rather have crabs than to own another one. Seriously, if you despise the 270, why do you think you would like the 6.5-06 ? ? You would have to MAKE cases and then the performance of the two cals is so close you or the game COULD NOT tell the diff. You can also get ammo for the 270 from ANYPLACE that sells ammo. It does not make any sense except that you'd have a cal that few have. Jerry
jwall- *** 3100 guy***
A Flat Trajectory is Never a Handicap
Speed is Trajectory's Friend !!
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