Is this a 223 ? if so you might do better BM2 or with AR2206h. Those groups are pretty good so if you can't get any better with faster burning powder stick with that load.
Sometimes some rifles don't like those Barnes bullets but if you play around with seating depth and different powders you might get them shooting good.
I used those Sierra 63gr bullets years ago in a 22-250 and found them very good on goats and deer, haven't used any in recent years though.
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