If you had a Colt, DD, BCM, or even an LMT I would probably go out on a limb and say that your chamber is probably not in doubt. That's because they are known to be consistent.
With Bushmaster it's anyone's guess as they have proven to be inconsistent. You would need to do a chamber casting or you could use Ned Christiansens chamber checker.
Ultimately if you really want to know get some M855 or M193 and test some rounds. Look for blown primers or rounds that fail to extract.
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