Best?
Do you mean best knockdown or accuracy?
CCI tend to cycle in my semi better than other brands and have better ignition.
However I found their Subs hard to chamber in my bolt action CZ.
I've never had a rifle that liked the super fast velocity .22 ammo, ie CCI Stingers and Velocitors or the Aguila Hiper stuff. All sprayed like a #00 buckshot pattern.
Accuracy is specific to each rifle though.
My current .22, a semi auto AR is real fussy and only likes the stupidly expensive CCI 'suppressor' HPs and the nice and cheap CCI 'standard' round noses.
Lucky to same POI, so I have a hunting and a plinking round.
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