Went to the range today. Shot 50 rounds of Winchester White Box, 100 rounds of Perfecta, and 100 rounds of Magtech. No issues. Used my brand new magazine along with my other four...no difference in performance, though the springs in the new mag seemed stiffer than the others. Of these 3 ammo brand, I prefer the Perfecta. The Magtech was extremely dirty and the WWB was, well, WWB.