Let me set a factor- I got a deal from a former agt(ret) whose grand daughter dragged a rifle out of a closet. Granny made him dump a 70 yr.collection of LEO/Pistol team stuff. I sold some guns for him but got all the ammo free. CAse of 45+, case of 223+, 7K+ 22LR! Some stuff marked $1. a box!, a full case of WW 22LR rnl 40gr. My own stash had Rem Golden Hornets?, Fed 550 rd 36gr. hps, CCI velocitors, and a box or 2 of CCI 32gr. Stingers. I have a Rem 552, Ruger 10-22, Ruger Charger, Walther P22, S&W M17 6", Berreta M21, and an old bolt action 22 from my wife's Dad that is God knows how old.
The very high speed stuff is great for commercials, but it is not accurate in any 22 I own! The Stingers blewthe 552s floorplate out due a "fire out of battery" malfunction. Never tried that round again ! THe Beretta M21 will feed ONLY Rem 22 Thunderbolt Truncated cone Highspeed HPs. Everything else will feed fine will all ammo. The Ruger 10-22 has a Green Mountian HB Conversion that got close to .5" groups w CCI MiniMag HPs. I got a couple boxes of Subsonic 22lrs to work on a cutomers supressed Ruger 10-22. I started checking all my 22s with it and itbeat the accuracy in every rifle/pistol it tried. Both CCI and Rem HPs did very well. The CCI HPs have larger cavity. Note as above: Beretta M21 only did the load indicated.