Choices are 350 legend, 458 Socom, 450 Bushmaster. Maybe 6.5 Grendal. Cost for ammo and reloading components are to be considered. I think the standard 223/5.56 bold can handle the 350 legend. Others require new bolt as well as barrel or complete upper. I have seen 350 Legend in stores recently and I've heard it is equivelant to a 30-30.
