I'd recommend trying the Hornady 55 Spire Point Boat Tail (SPBT) bullet with cannelure, P/N 2266.
It's basically the same price as their 55 FMJ, but is significantly more accurate and more useful. My standard load (mixed brass) using TAC is 26.2 grains, COL = 2.185"-ish (case mouth is about 1/3...