This is regarding pistols, so things may vary for rifles:
The only "match" ammo I care about is the one that gives me <1" groups at 25 yards.
All "Match" usually means is that they are claiming to take more care about bullet weight and case dimensions--particularly the rim thickness.
For me, some of the most accurate has been cheap ammo--Hansensold some really great super-greasy but accurate ammo about 15 years ago produced in Hungary and Wolf Match Target has been excellent.
When I tested a bunch of .22s years ago, Rem Target gave me ½" at 25 yards, Wolf Match Target was good for 0.55-0.65", Hansen was good for 0.72-0.76", and Eley Standard and Tenex gave me 1.68-1.69" groups. Fiocchi MaxAc gave me 2.26" and Fed. Champion was good for 2.46".
This does NOT mean, however, that you would get the same results in YOUR gun.
The thing about .22 LR has always been that you have to test a wide range of brands and, when you find one that you like, stock up on that particular LOT NUMBER.
Finally, never fire groups without first firing at least ten rounds through a clean barrel. It has been reported that Olympic shooters seldom, if ever, clean their barrels and claim it can take a LOT of rounds to get the barrel seasoned and accurate again.
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You don't think lead bullets can be accurate?The most important part of a bullet for accuracy is the BASE. Lead wins pistol matches [size=78%]and, in my experience, is almost always more accurate than copper-washed bullets (never found a copper-washed bullet that was accurate enough for match shooting and I don't think I have ever seen jacketed or plated bullets in .22 LR) or plated bullets.[/size]
[size=78%]So, for those that keep claiming that lead bullets lead the barrel and aren't accurate at velocities over 800 fps, please look at your .22 LRs.[/size]