In my life's quest for the ultimate accuracy I have spent more money on a plethora of 22 ammo than any other caliber (for accuracy). The single most accurate round (out of my CZ 453) is the CCI Mini-mag. When they were hard to come by, the Blue Box Federal #510 is my second choice and I'd say the American Eagle is #3. All are high velocity 40 grain bullets.

In some other rifles I actually do incredibly well with older Winchester Wildcat 40 grain which is also a high velocity round but basically their lower end promo ammo. I have never had really great luck with Remington and the worst of the lot in every gun I own (should actually be the best) is Eley target ammo. For some reason the stuff just shoots terribly for me. I have 4 different variants and have had no luck at all.

I will say that lately I have had a few more "duds" with the CCI ammo than in years past. Not a whole lot, but more than I had been used to. I can also hear and feel some variation from round to round. That said, it is still quite accurate and probably still the most reliable.