Varies. I never buy target grade, however, even for bullseye competition.
Why?
In the 1980s, a club I was in regularly tested a wide range of .22 standard velocity rounds before we bought ammo in bulk for each year, always using a Ransom Rest. We found the "best" varied year-by-year, and sometimes quite significantly even between lots. The biggest surprise was that the top-performing standard grade regularly bested most or sometimes all of the more expensive target grades we tried, and we saved a lot of cash that way. That choice lot became our bullseye ammunition for practice and competition for that year (and the first part of the next). As we won both team and individual state championships, it obviously worked for us.
I recall that one year, we could not find any ammunition that came up to the level of the standard set during other years. Likewise, a couple of other years, several brands were outstanding.
I can't defend it statistically, but now I simply shoot groups at 25 yards using sandbags using my High Standard, and compare the size of the groups containing 80% of the tightest shots. This seems to throw out some or most of the errors I inevitably introduce, not being a Ransom Rest myself! My results with my HS Military Trophy are about the same as I get from my K-22, fired single-action also from a bagged rest (it was tuned at the factory in the late 1970s). I compare at least five, ten-shot groups on a windless day.
(Gun writer Massad Ayoob does about the same thing, I've learned, taking the best three shots out of a number of five-shot groups to get a quick and dirty estimate of the accuracy potential of a firearm. I seem to recall he found it reasonably approximated Ransom Rest results, and to a greater degree than one might reasonably expect.)
So I suggest trying a selection of brands, then picking up a good supply of whatever works best while being sure to get rhe same brand and lot. If target grade floats your boat, fine. But I am pretty sure the best standard grade will "outshoot" the shooter! (High velocity is another matter, and always seems to sacrifice some accuracy for that additional boost in speed.)
Stored cool and dry, it'll last quite a while. I have some .22 long rifle ammunition (winchester) my older sister used in becoming CT State junior smallbore rifle champion in the early 1950s. Every couple of years I fire a round. It still fires perfectly -it has been stored cool and dry.