As we know, .22 rf arms are just as sensitive to ammo as centerfire rifles and pistols. Since all .22 lr ammo is store bought, its a matter of trial and error to find the fodder your weapon likes. I recently made another run at finding the right ammo to use in my rifle and revolver. Each has its own tastes. Starting with the rifle, top accuracy in the past has been achieved with RWS R50s. This is excellent stuff, but expensive. Current prices run about $130 for a brick. After trying several less expensive types of match ammo, including Federal Premium Gold Metal sub-sonic, Aguila Match Rifle and Wolf Match Extra, I found the Wolf delivered excellent accuracy in my JC Higgins (Marlin) rifle, at about half the price of the R50s. One target hanging on my wall measures .375" CTC for 5 rounds from a rest at 50 yards.
Yesterday, I went to the range again, this time with my S&W M-17 revolver (aka a K-22). I tried the Wolf, the Aguila, some RWS R-100 and the aforementioned Federal Premium (aka 711B). All are subsonic and in the past the pistol has preferred hi velocity Winchester Wildcats over the expensive R50s. This time, it turned in .75", 5 round groups at 25 yards from a rest with the Federal ammo. The Aguila was close at about 1", the rest were much bigger. Cost of the Federal match ammo is only $40 per brick, a real bargain.
All this goes to show that every .22 lr firearm is unique. You cannot predict which match ammo will deliver the best accuracy in any given arm, only trial and error will uncover the truth. Its the rimfire equivalent of load development. My lesson learned is, if you check enough different types of match ammo, you may find some bargains that are just as accurate as the high priced stuff. The cheapest promotional ammo is not even close. Good luck - CW