With this, the flat-base bullet—with a dimple to keep the heel uniform for better accuracy ... Grand Slam and will certainly influence penetration. DeepCurl is absent a cannelure. In July 2009 ...

To start, 63.0 grains of 2000-MR fired Speer 250-grain Grand Slam bullets at 2,538 f.p.s. and 64.0 grains launched them at 2,570 f.p.s. I stopped at 65.0 grains because accuracy was good ...