rost495, did you look at the 458 Socom, or 450 Bushmaster when you bought the 50 Beowulf? I reload, and it seems like the 50 Beowulf would be hard and then there is the availability of bullets. The 458 Socom can take 45-70 bullets. There seems to be a lot of cartridges trying to fit the AR magazine well. I like the 6x45 which is a 223 necked up to 6mm which is 243. Doesn't have the power of a 243, but seems to have more umpth than the 223 and it uses the same bolt and magazine. Same with the 300 AAC. The 50 Beowulf, I think uses the same bolt for the 7.62x39 as well as the 6.5 Grendel.