It really isn’t excessive headspace that’s the problem. The chambers were cut VERY generously to accommodate the poor quality (by even contemporary standards) ammunition produced during WW1. There was a lot of back and forth on this but ultimately the decision was made in 1915 to ream the chambers larger. You can get better case life by neck sizing with only full length sizing when absolutely necessary. Even still case life will be short.Before you shoot it (if you do) check or have checked the head space. These are notorious for having excessive head space. It's an easy fix if it's incorrect, these have replaceable/changeable bolt heads to adjust to the proper specs.