Buying "over the counter" may be your problem here. Most places don't carry top quality .22 ammo. because most folks refuse to pay accordingly for it. I'm a terrible shot, so it really doesn't matter what I shoot, but for the folks who really insist on the best, I always suggest they start with Ely Tenex Ultimate EPS and work their way down the list from there: Lapua Midus Plus, RWS R50, etc. But having said that, I know of many instances where folks who are really good shots, finding their particular firearms prefer a relatively cheap round such as Western Value Pak or CCI Standand to the more expensive stuff. I used to tell my customers to buy a single box of several different ammuntion and see what works best in your firearm because firearms were a little like people -- some of us prefer hotdogs and some prefer hamburgers. However, there are a couple of more points you might want to consider. First, fifty or more years ago the .22 shooters who were looking for accuracy all used these little devices that measured the thickness of the rim and then placed all the rounds with the same thickness in their own separate piles. Even within the same manufacturer, there were considerable differences. More recently, I understand folks don't do that so much any more. Now they use a different little device that measures the "concentricity" if that's the right word, of each round. Once again, even within the same manufacturer, there's a great deal of difference in how straight the bullet is seated in the case. If you do an internet search for it, you find articles about "concentricity" in .22s and devices to measure it. They ain't cheap, but the folks that use them, swear by them. Best of luck - keep us informed about what you find.