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Interestingly, it doesn't look like an AR, more like a single shot.
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It isn't the platform that is being tested, it is the barrel twist. A 1:9 twist AR barrel will be no different than a 1:9 twist single shot barrel. By that I mean, 1:9 is 1:9, it does not vary because it is in one platform or another.
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My data on 1:7 and 1:8 twist ARs says that they didn't shoot 55 grain bullets as well as 77 grains in the 1:7 and 60 and 63 grains in the 1:8.
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My 1:8 twist AR shoots 55 gr just fine. I shot a 3-Gun match yesterday and was hitting 500 yard targets on the first shot every time. The same can be said for 3 of my teammates who were also shooting 1:8 twist ARs with 55 gr rounds. The 1:7 and 1:8 will shoot bullets from 55-77 gr just fine, and will shoot the heavier rounds better than a 1:9 twist.
But you are right, some guns are different than others. However, it is much more likely that you will find a 1:9 twist AR that likes heavier bullets than a 1:7 or a 1:8 that doesn't like 55 gr projectiles.