Just finished running 550 rounds through the new pistol. 450 rounds of 39 gr. Hornady V-MAX 50 rounds Fiocchi 40 gr. and 50 rounds of Federal 50 gr. Outside of the very first round (Federal) it has run flawlessly. The S&W is without a doubt the best 22 mag semi auto I have owned! I have had the Excel Arms Accelerator, Kel Tek PMR 30 (the worst of them all), Rock Island/Armscore, and even the Volquartsen.