1/2moa out of a 22 is quite a task. ive got a couple dollars invested in my 22, and about 30,000 rds down range and have never gotten 1/2moa @ 100yds. i usually get 1 moa but not always
I've done it with my 22, on my best day of course. I've even hit standard size targets at 200 yards. It drops almost 3 feet, but I've done it.
IMO the most important aspect of accuracy is a good scope. I have a cheaper scope, but it's 32 power at full magnification. Don't get me wrong a good gun still helps. I have over 500 in my 10/22.