What cartridge is this?

This is about the size of a 7.62×39 before the second bottleneck. What is this? The headstamp has circle with cross with cross(+), WR, and 6

7.62 X 51 NATO Blank M64. Really popular for training back in the '60s and '70s, often in M13 links for the M60 with a BFA

Taber, I thought it is a M82 no?

I shouldn’t reply without checking my references! My memory has lost it completely!

Taber, no worries. Good to see I am not the only one making mistakes…