Hello!
I recently purchased an Atlas, and I am in the process of tuning the spring weight to get the best sight return. I tried the stock recoil spring, which I believe to be 9 lbs, and the sights seemed to return to a few inches above the top of a USPSA target at 10 yards or so. I put a 13lbs recoil spring in, just to see if I could get a better sight return, and it still returns quite a bit above the original point of aim. When shooting doubles I get two distinct groups about 8 inches apart, with the second group above my original point of aim. I do not have amazing grip strength, it is quite average. For reference, I normally run a Czechmate and Shadow 2 with 10 lb recoil springs, and I get a near perfect sight return. I am wondering if something is up that I am missing, or if I need to crank up the spring weight to 15, or 18 lbs. The ammunition I am using is PMC 165 gr. If I need a stronger recoil spring, would something like a Wolff recoil spring work, and be drop in? Thank you!