I have a SP101 22 that I purchased new awhile back. Started out with reasonable trigger; not too stiff but smooth. I guess I have run it through about 500 rounds. I put some hammer shims in it to remove any wiggle. That's supposed to smooth out the trigger. I didn't like the feel so I removed them. Now I am experiencing a bit of roughness on the first part of the trigger pull. The only way I can describe it: the first part of the trigger pull rotates the cylinder and then it moves to a second level. Pulling the trigger through the second level results in trigger release. Which is all ok, it's just sometimes the first level feels gritty. Any one else experience this?