Great read friend. While I don't have the quality of firearms you have I enjoyed shooting my 22LRs out to 300 yards. Its really satisfying to hear the little "ting" when you hit steel at that range. Back in the mid 80s I used to shoot 22 indoor match an shot a variety of ammo out of my Win 52 and got the best results with Eley Black.
I must have six 22s currently and my Ruger 10-22 and Winchester 250 are my most accurate (both stock versions). The 250 shoots little tiny groups with Win Wildcat (elcheapo) ammo. Not even sure if they still make it but I amassed a few bulk boxes of it.
But my most funnest (is that a word) to shoot is my S&W 15-22. Surprisingly accurate and with a 30 round mag one can have a blast with it.
I'm glad you started this thread. I forgot how fun it was to shoot way out there with the diminutive 22LR. Its not just for squirrels and kids! I guess I'll have to gather mine up and head to the range.