I found this round today, what's odd is it is 1 piece, there is no actual bullet. The round is in bad shape so I can't see any stamp marks on it but it is a rimmed round almost like 762X54 ammo. The photos are kinda crappy sorry about that. I was thinking it was a blank but there is no crimping on the end the whole thing is solid 
I found this in a school yard, I did find some items here in the past which were linked to the National Guard so maybe that might help you guys.

I found this in a school yard, I did find some items here in the past which were linked to the National Guard so maybe that might help you guys.







