Two years ago I had a .223 AI built on a Rem. 700 with a Brux 1 in 8.6 twist to shoot the 75 Amax. The rifle shoots great and velocity runs at 3150 with moly. The problem is I built this rifle to shoot in sporting rifle competition and feeding is not reliable enough for competition. The question is..... Which cartridge would you choose for my application? The range is 200 for sporting rifle but I do shoot at 600 as well. Does the extra capacity of the .222 mag and/or the 22-204 give a worthwhile increase over the .223?