That looks to be pushing the edge. My older Lyman Manual (47th) shows a max of 61.5 gr RL12 and 2722 fps with a 225gr. That would be too hot for me in my Rem. You might want to try IMR 4064, it shows about 2650 fps @ 60 gr, with lower chamber pressure. I would be hesitant to go over 60 gr of RL 12 either. Personally I use 57gr of RL15 and a 250gr which still beats factory by about 50fps and is not quite max, but is enough for my gun. I dont think wringing an extra 50-100 fps is worth the effort.