Can't beat thet. My old Bushmaster Predator shoots like that. Only improvement I made on it was when the 2 stage factory trigger began to act up I put a 3# Timney SS in it. Don't remember for sure, either an 8 or 9" twist.
If you reload you might try the 55 gr NBT & H335. This load is a tad above listed maximum but dosn't show any excessive pressure in my rifle.
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This was @ 100; then my hunting partner sat down and shot an exact mirror image of this 5 shot group except his would have overlapped my group but on the right side of the vertical center line.
