It's actually (technically) a 33A, as the 33 was straight grip, and the 33A is pistol gripped. Yes, it's the old 9.3x57R that had the rim recut to .38-55 so std. .38-55 brass can be fired in it by seating the bullets out a bit to touch the rifling.
It shoots under 2" at 100 yds. with .375" cast lead bullets.
Thanks!-Vall