After doing some looking into this I'm going to pass. I still want to do a heavier cal, ar15 upper but I want it to be easy to load for and get components for. If it gain some traction, the .300 Ham'r from Wilson shows good promise. I like the .458 SOCOM also but it would get expensive to shoot much.

“You never need fear a man, no matter what his size. When danger threatens, call on me, and I will equalize.”
Samuel Colt.

�Common sense is genius dressed up in work clothes.� - Ralph Waldo Emerson