If you buy European ammo loaded to the CIP standard (56,565 PSI) it'll hang right with 308 etc - bested by nil - probably with slightly better ballistics than cheap 308 stuff. Just don't use any USA ammo as the dumb buggers have never understood how it works.
With reloads there are a few projectiles about that will really make it shine, the Hornady 170 SST is the best as far as I've experienced. From my 1956 Brno model 21 (fitted with a 1920's german sporter barrel) I'm getting consistent 30mm groups @100M with a MV of 2680 fps and am able to hit a 250mm gong with ease first shot at 300 - and thats with a light "snotty" rifle.
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