Not so much with the powder, but the bullet. The Z load used a boat tailed bullet, which gave longer range for long range area firing by MG's. The boat tail in a rifle allowed excessive erosion in the bore/chamber throat area. I'm sure someone will correct, but that was my understanding.

Quote Originally Posted by FugWit2 View Post
Excuse my ignorance here, but I was under the impression that "Z" suffix ammunition was specifically earmarked NOT to be used in rifles, only in machine guns. Something to do with the powder load IIRC.