I must have gotten lucky with mine. Power Custom did the work on it for me and said the barrel is .355. I shoot 356 38 Super 147 grain from Berrys and the shoot great.
I shoot the CCI Std and decided to try the new Clean (Blue) ammo. Worked the same as the Std. but did not get the same accuracy. Switched back to the Std.
My club has a state of the art 25 yard indoor range so I take advantage of it. My Volquartsen Lightweight Rifle, Scorpion Pistol and CMMG Guard 9mm PCC all sighted in at that distance. Works great.
If you have any thoughts about shooting a 1911 center fire gun at future matches, the Volquartsen frame .22 is a great way to use the same equipment each time. Set them up the same, then it's just a matter of caliber.
If you have any intent to get serious about Rimfire/Steel Challenge, get a rifle made for that type of shooting from one of the top rifle makers for the sport. I recommend Volquartsen. I have one and with the right ammo, performs flawlessly.
For me it would be RO moving with squad. Gives both sides a chance to learn how each reacts. The RO's timing with the buzzer. Shooters reaction times. Etc.
I think that being the have started a new competition team, and they have a couple of good revolver shooters, that we may see some great guns for competition coming out of their shop.
I send all of my S&W revolvers to Ron Power at Power Custom to get tuned up for any planned competition. He basically replaces every part in the frame, then hand fits it all to perfection. Contact him with any questions. He makes all of the parts for the gun in his shop.
John Allchin parts are the best of the best. I have 2 of his comps. They came with a couple of different washers to assists with th he proper alignment. Dont hesitate. Order one now.