Originally Posted by mainer_in_ak
Med,

I don't think cfe 223 will give you acceptable velocity using 350 grainers from a carbine barrel. Its too slow.

I've got over 7 years of handloading and hunting a similar cartridge doing exactly what your about to do: 350 grainers from a 20" barrel.

Tac was too slow, 2230 was too slow. About the best I found, was slightly compressed loads of rl 10x. Better velocity and less recoil too.

Thanks for the heads up. I actually think I have a little 10X around here.