Our PPC club in Windsor ON allows the TT-33 (with 7.62x25 "range safe" (non-steel core)) ammo to be used. 2-gun and 3-gun matches I have been to allow it (if shooting paper targets then steel core allowed). Since these matches are slightly less formal than IDPA/IPSC, the RO will allow things like starting with empty chamber since there is no safety.
Last 3-gun match I was at (outdoor) one guy used an SVT-40 and his TT-33 (don't recall his shotgun).
I am currently using a Norinco TT-33 clone in 9mm (with the manual safety) as my pistol in 3-gun matches. Have the holster, 5 magazines, etc. Fun gun to shoot. I am planning on using my TT-33 with 7.62x25 for PPC once the indoor league starts up again (mainly because I want my brass back and the outdoor ranges for 2-gun and 3-gun don't really let me keep my brass). I've reloaded a few hundred range safe rounds using Campro projectiles and AA#7.