I am surprised by how many replies here like Remington .22LR. My experience over several years has been that Remington .22LR made my guns the dirtiest, and also had the highest failure-to-fire rate in both semi-autos and revolvers.
I have had the best experience for basic (read cheap) bulk .22LR has been with Federal bulk boxes.
The best so far has been, wait for it, Winchester M22
Blazer 40gr. standard work well in everything I own......rifle, pistol, revolver, bolt action, semi auto. Everything. Respectable accuracy. Dependable. I am still shooting some I bought 15 years ago. Back when you could buy 5K for less than $150 delivered. I bought 20K and glad I did.
^5Pretty much the only thing I actively avoid is Thunderbolts.