I have been shooting 57 grains of RL15 with the speer HC 250. My whelen has a 26 1/2" shilen barrel and I get @ 2550 fps. I tried to work up to 59.5 but it wasn't happening, to much pressure.I have over 1000 rounds of this load thru this gun and no problems. I have used fed,rem,and winchester brass without any change in velocity and some of these cases have been loaded eight times without any trouble.One difference with my load is the OAL. I'm running longer than the books call for and this might have a small effect.

"If all the good luck and all the bad luck I've had were put together, I reckon it'd make the biggest damned pile of luck in the world." Charlie Goodnight