I use RL 15 pretty much exclusively. I use their old load data, because they have become lawsuit sinsitive in the last year or so, and have drasticaly reduced their charge weights for the 250gr. Speer and their 220gr Speer. They have no data for the 225gr Sierra, but I shoot 60.5gr. of RL 15 and my primers are still slightly rounded. Out of a 24" barrel it chronographs at an average of 2725fps 10ft from the muzzle, and gives 3700 ftlbs of energy. That's my deer load, and its as flat as a Remington 30-06 load with 180gr. corelokt psp bullets. Its good for 500 yds for nearly anything except moose and bear. For them, I would use the Speer 250gr. with the old max load of 59.5gr. which still didn't show signs of pressure, and produced casings with less pressure signs than factory 30-06. Velocity average was around 2650 from my rifle. Work your loads up from about 56 grains and watch for signs of pressure.
