My 40X .22LR was made into a benchrest rifle, having a Lilja barrel, McMillan heavy benchrest stock, Jewell trigger and Harrell tuner. It sports a 36X Weaver bumped to 42X.
I can't shoot better than this rifle and ammo combination. One match, it shot two 250s and a 249 to tie a 6th place world record. The last shot of the third target was just off the ten by a hair. I say it was the ammo, but who cares?
I started shooting rimfire benchrest with a factory Win 52C, modified it with new barrel, stock, etc, but it wasn't as good as it needed to be. I also had an Annie 54 with a synthetic stock, but again, not what I wanted. The 40X is my favorite action, smooth and tight!