Miles,
I don't know how you managed to get only 3000 fps with the 53 TSX and TAC. I've loaded TAC with 50-55 grain bullets in a BUNCH of .223's and the lowest velocity I've seen with Ramshot data is about 3150 with the 50-grain Ballistic Tip--in my 16" barreled Bushmaster AR-15.
In normal-length barrels TAC normally gets 3300+ with 50-53 grain bullets. In a 26" 700 it gets over 3400. Maybe you just have a special lot of powder?
