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Any chance of getting a couple < 150 Grains loaded?
I usually load up a bunch of 150 FMJ BT's with cannelure and lightly crimp into the cannelure. This allows the brass to be fully fire formed at the shoulder as opposed to the soft squeeze put on by the 300/221 die when converting .223 brass. While the brass is being formed by higher pressure loads, I've seen some really strange behavior.
Once you're using fire formed brass that has been full length sized (and optimally checked for neck thickness), if your barrel won't stabilize 110-150 hypersonic then you know its a manufacturing issue that may or may not get better with use. If they do stabilize try progressively increasing bullet weight, while decreasing powder charge.
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