22's being the fickle things they are, will show a preference for not only one make of ammo, but even specific lot numbers within that make. I have a lot# of Lapua Super CLub that my 541's and my Finnfire just love. Matter of fact, I shot my best ever 5-shot, 50 meter group with it the other morning (very calm, great conditions) This group measures a mere .090" c to c!! I also have a lot# of RWS Rifle Match that shoots very similarly, but is pricey. Nevertheless, when I find a lot number that shoots well, I will buy up a case or more to assure that I have accurate ammo available without the big "search" again. Regards, Eagleye.