You think it might still go off after 50 years?
If stored properly, yes. Based on the picture, there is no evident corrosion or the dreaded "green scale" around the primers. But its the owners call. Had some .45 milsurp ball ammo and Vietnam 5.56 stuff worked fine, but just for range time now.
I would email these guys a pic: cartridgecollectors.org , before I fired any, Who knows?
I have 28 year old Argentine Mauser 7.65mm x 53, 187 gr BTFMJ. rounds and shoot about 200 rds a year. Never a FTF. Accurate as the shooter is, and kicks like a mule. Its stored (all my ammo is), dessicant is replaced twice a year, in milsurp ammo cans. Stored indoors not in the garage or attic, or basement.
Good Luck with it. Could be worth more NOT to shoot it?
Just my .02 cents(pre-tax).