A couple of months ago I bought a 39A--ser. no. Lxxx at a gun show and brought it back to life with a new firing pin, buttplate, and a good cleaning. I wanted to mount a period-correct scope and did so with a Weaver K4 that I bought at the big Reno show last month. Well, I tested it at the range today with samples of a half dozen ammo brands and types and couldn't get a decent group with any of them. I was shooting at 10 meter air pistol targets at 50 yds--the target has a black bull of about 2 1/4" and the only ammo I had which would stay in the black was some old Remington Pistol Match. Some of the other ammo samples were admittedly cheap stuff like Remington Thunderbolt and some Federal Hi-Power but I also shot 20 rounds of RWS Target and it didn't do any better. I have several others to try and I should have held off on this posting until I do but thought I might get some input first. I should add that I can see no damage to the muzzle of the gun or anything else that is obvious. The gun has pre-Micro- Groove rifling.