Get at least 10 boxes of different .22 rf in the velocities and bullet design you want, pick a calm day, set up a 25 yard target, set up sandbags or a rest on a solid bench and shoot 10 shot groups at 10 different 1/2 inch dots on your target. It will amaze you to see the difference in the groups for each ammo type. Your rifle will tell you which ammo to buy and use. I have one rifle that loves wolf target, another that loves the Federal Game Shock (or whatever its called). If none of the first 10 ammos are winners, get 5 more types. You will find what your rifle likes.
Just my 2 cents
rc