Originally Posted by WyoCoyoteHunter
You can easily form 7mmW brass from 7mm RM ... One pass though the Wea. sizing die and you have it.. My WM shoots 160's about 200 fps faster than my 7mm RM!!

Case capacity pretty close. 7RM psi is capped by SAAMI, is lower than 7WBY. There have been long discussions why. Running at equal pressure, not that much difference.

DF

Last edited by Dirtfarmer; 04/12/19.