It totally depends on the gun. My new Ruger SR22 shoots best with bulk pack Federal. Well, it shoots a little better with RWS Target, but that stuff is expensive. RWS turns my old Remington M512X bolt gun into a target rifle. Eley match works best in other of my guns.
In the SR22, the Federal shoots 2" at 25 yards. RWS shoots 1.5" at 25 yards. It's a plinker, I shoot Federal in it.
My Rossi 511 revolver shoots 2" with Federal, 1" with Federal Auto Match. The Auto Match is pretty affordable, keep a box for the Rossi for plinking and WHATEVER as 1" is as good as I can shoot with iron sights from the bench at 25 yards.
My scoped Mk2 shoots better with Federal bulk than with Auto Match. I've not tried any of the high zoot match ammo in it. I mean, it's a hunting pistol with a 2x optic on it and it shoots 1" at 50 yards from the bench, plenty accurate enough to head shoot a squirrel.
If I shot serious competition with a .22, I'd work with Eley and RWS and hang the price of the stuff. But, I'm a hunter/plinker and the stuff is just too expensive for my blood for those uses. I ain't that mad at those tin cans.
CCI mini mag and Stinger (except in my match barrel Contender which won't chamber it as the case is too long) and others like Winchester and Remington never seem to work as well as the bulk Federal. Oh, CCI is always the best for ignition in guns that give occasional misfires, but accuracy, hell, the bulk works as well or better. This new Federal Auto Match hasn't really impressed me in ANY of my dozen or so .22s except in the Rossi.
One exception, Stinger, usually pathetic for accuracy, works BEST in a cheap little Phoenix Arms POS I have. The maker warns not to use it in the gun, but i've fired some in it and in the past have carried it afield fishing just to have for a kit gun as the gun is quite accurate, though a cheap zinc wonder, I'll admit.
