Took my 357 out this afternoon to try out some new handloads. Before I tried the new loads, I decided to shoot up the last of some loads I made a few months ago. 110 gr. HDY XTP over 6 gr. Unique with a CCI 200 primer. This is a very mild but accurate 357 mag load, but is still hotter than a 38 special +P load. I have fired several dozen of these loads without any trouble. Well one of the shots went PFFFFTTT instead of BANG, and no new hole in the target, so I pulled the cylinder and sure enough, the bullet was stuck about an inch down the barrel. At first, I thought maybe I missed charging that one, but there was half burned powder in the case and on the back of the bullet. So I am wondering what I might have done or missed to cause the powder to not light. Any thoughts? Did I not crimp tight enough, or maybe something contaminated the powder? These cases are all once fired brass. I don't have a tumbler, so I just de-primed and sized them as I got them, but they all looked clean when I loaded them.