Ok, all this talk about the M58s that you all have forced me to pull out my sales receipts.
I had one back in March of '66. Serial # S259XXX.
They were relatively new at the time and ammo was difficult to find. The Rem. 210 gr. LSWC was easier to get, also easier on the shooter than the 210 gr. JSP.
I sold it off a couple of years later. I've always thought about another one but haven't done anything more than think about it.
I think my Brother up in NH still has one.