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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6mm rem or 6mmAI
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<blockquote data-quote="Trickymissfit" data-source="post: 451870" data-attributes="member: 25383"><p>I agree with your thoughts here with the exception of case design itself. An example here is the 6.5/.284 verses the 6.5-06. Both cases are about 120% max capacity for the bore (I'm roughly guessing, but this can be figured out on paper). Both rounds shoot well, but the 6.5/.284 is well known for it short barrel life verses the 6.5-06. The case neck is much too short in the .284 case, but the shoulder angle is acceptable. The same can be seen in a compairison between the 6/.284 and the 6mmAI. Both cases are overbore as we already know. But one case has a much longer neck design putting the hottest part of the flame path well inside the neck. There is another version of the 6/284 that has the shoulder pushed back .100" for nearly a 50% increase in the barrel life with no serious loss in velocity. The difference is in case design. The 6mm has a 26 degree shoulder angle, while the Ackley has a much steeper 40 degree angle. This 40 degree angle does three things well. It tends to seat in the shoulder area a little straiter (ever so slightly). The flame path ends up being further away from the throat much more than the generic 6mm remington case. The chamber pressures tend to direct brass flow strait into the shoulder / neck area. With the narrower angle of the 26 degree shoulder, there is less resistence to brass flow, allowing the brass to flow into the neck. On the otherhand I personally think the 40 degree shoulder angle (35 as well) will creat the dreaded doughnut much easier than the narrower angles do. I can't prove this beyond a doubt, but I'm seeing it. I personally don't think you can go wrong with either case design, but I also think they are at their best with 85 grain and longer bullets</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 451870, member: 25383"] I agree with your thoughts here with the exception of case design itself. An example here is the 6.5/.284 verses the 6.5-06. Both cases are about 120% max capacity for the bore (I'm roughly guessing, but this can be figured out on paper). Both rounds shoot well, but the 6.5/.284 is well known for it short barrel life verses the 6.5-06. The case neck is much too short in the .284 case, but the shoulder angle is acceptable. The same can be seen in a compairison between the 6/.284 and the 6mmAI. Both cases are overbore as we already know. But one case has a much longer neck design putting the hottest part of the flame path well inside the neck. There is another version of the 6/284 that has the shoulder pushed back .100" for nearly a 50% increase in the barrel life with no serious loss in velocity. The difference is in case design. The 6mm has a 26 degree shoulder angle, while the Ackley has a much steeper 40 degree angle. This 40 degree angle does three things well. It tends to seat in the shoulder area a little straiter (ever so slightly). The flame path ends up being further away from the throat much more than the generic 6mm remington case. The chamber pressures tend to direct brass flow strait into the shoulder / neck area. With the narrower angle of the 26 degree shoulder, there is less resistence to brass flow, allowing the brass to flow into the neck. On the otherhand I personally think the 40 degree shoulder angle (35 as well) will creat the dreaded doughnut much easier than the narrower angles do. I can't prove this beyond a doubt, but I'm seeing it. I personally don't think you can go wrong with either case design, but I also think they are at their best with 85 grain and longer bullets gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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