Over the past week the 3T/Model 190 it has fed every odd .22 cartridge I've thrown at it, from assorted .22 Shorts to 'Quiet' ammo to a Mulligan Stew of oddball 22LR from various manufacturers.
I had to change out the front sight for a taller one, so I needed to check zero. Today I ignored the rain and fired a few 5 round groups at just short of 50 yards, using the window of my old pickup a rest. Ammo was Federal 36 grain bulk HP. This was occurring regularly when I didn't screw up a shot. The old rifle is certainly accurate enough for any use I'll put it to.
03/23/13 Update:
...and finally today, I sat down at a bench and adjusted the last bit of right windage out of the sights. I was shooting three shot groups to conserve ammo and kept seeing stuff like this and thinking "Wow, those are about a half inch."
I put a tape on it before I drove back to the house and it was 5/16". This old rifle is shooting as well as any .22 auto I've ever owned, the best of which was an old Mossberg 151-M.
So color me happy as a clam.