Try Retumbo. I'm shooting bugholes with a stock r700 26" varmint barrel (with and without TBAC 30BA), 105 matchburners, and 49.0 grains* (RP brass, CCI200, 2.800 COAL, 2930 FPS at 900 FASL/2400 DA). The Hornady 105 HPBTs were showing promise with the same loads, but the matchburners...