It would seem that the SD "can" be a finicky pistol. I've been using Perfecta ammo for a couple months, the same ammo which gave me issues at an earlier date. No issues at all with that ammo now. Tula is slightly less accurate, but just as reliable. Most Federal ammo is spotty in my personal SD !! Some is quite accurate some less so !! WW white box is not only less than accurate, but REALLY dirty !!! You have to try a bunch out and see what your PERSONAL handgun likes the best. I've had to do that with every gun I've ever owned. Personally if I can shoot groups of 4"at 25 yds. I'm pretty happy !! That is, as one notable firearms writer & researcher says, "minute of felon" !!! I'm good with that ! YMMV !!!