Re: problems with subsonic ammo
When it comes to .22 rimfire, being able to put the bullet where the cross hairs are every time, takes consistency in the ammo and consistency costs money. How much do you want to spend on a box of 50?
You aren't going to find what you're looking for in a bulk box.
For casual plinking when I'm not looking to win anything and am just shooting at golf balls and stuff like that, I shoot CCI Standard Velocity in the paper boxes. It runs about $2.50 a box of 50.
When I'm shooting a local benchrest match or just a friendly, informal competition, I shoot Wolf Match Target. This stuff goes where you point it a vast majority of the time. It isn't really match ammo, but it's really close at $5 for 50.
When I'm shooting a match where the difference between winning and losing is the difference between dishing crap out or taking it until the next match, I now shoot Eley Black Box. I find a lot number that my rifle likes and buy a bunch of it.
If all you're doing is dinging steel, maybe 3 MOA in size, the CCI SV will do you nicely out to about 300. It might go farther, but I've only done 300. With the Wolf, you can make that about 2 MOA in size. With a lot of Eley BB that your rifle likes, it'll do 1 MOA, but you have to be really good with the wind.
BTW, I never clean the bores on my rimfires. When I swap ammo, I just reseason the barrel. Well, actually, I do clean them; but at around 5000 round intervals.