Just for my own information, I pulled 10 rnds each of 175 GMM and XM118 LR from 2011 randomly from the stash.

For what it is worth, after pulling bullets from casings and weighing components this is what I found.

Both appear to use Reloader 15 as powder.

GMM adverage power charge 43.5
XM118 " " " 43.2

Bullet weights were the same.

XM118 bullets sealed at cartridge neck.

XM case weight is approx 3 gn heavier 404.1 than GMM 401.3

Primers both appear to be 210M.

This was done because at 200 yds. the impact has been identical.
Chrono at 12' is the same for both.

Conclusion 6 of one half a dozen of the other.


Semper Fi
Art