I'm curious, what is the exact head stamp? "WRA60", WCC60"? I have some old USGI 7.62 NATO brass from the 60' & 70's that I reload. Like Chris said, it reloads up fine. If it's actually 53 year old brass, I'd fire it, then anneal it. It should be fine. I do find it odd that HSM would be using 53 year old brass. I still use 30/06 brass from WWII and it also works fine.