I've got a Barrett M82 that I let others shoot.
For purposes of liability, and to make sure people don't shoot crappy ammo out of my rifle, I'm telling them to buy only American Eagle / Federal ammo.
But now I'm seeing XM33 and XM33C ammo.
What is the difference?
I'm thinking the -C might be like the XM855PD stuff, but I don't know.

Be careful with the XM33 American Eagle stuff. I blew out an ejector in my M82 and Barrett told me it was because of that ammo, that they've had a lot of issues with it damaging rifles due to primers backing out and similar issues. That really sucks because it was the least expensive ammo to let other people shoot in the M82, so now I'm on the hunt for something else. Thinking of trying some PMC Bronze.