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It look like a case near identical to the .264 Win Mag but in a rimless case instead of a belted one.
If it's powder charges are equal to that of the .264 Win Mag for a given bullet and produces the same velocity, I predict its barrel life will be less than 700 rounds if the rifle (and smmo and shooter) start off at no worse than 1/4 MOA at 100 yards. My .264 Win Mag shot about that well (and about 7/8 MOA at 1000) had it barrel go to pot at 640 rounds. Less if high-heat powders are used.
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