It is my understanding that the 338-284 will run head to head with the 338-06 with a few less grains of powder. So, it's more than just brute case capacity, although that is a very big factor. It's also case efficiency. With the newer powders, more can be done with the smaller, fatter ctgs., thus the high performance of the WSM's, et. al. Now, they may run at 65K pressures vs. 60K or less for the older ctgs. If older ctgs. are pushed to an equivalent 65K+ pressure level, then it's another ball game.
DF
