I have a two year old Glock 23 that I've probably run about 1,500 rounds through. I mostly use plated ammo that I buy at the gun show from a local remanufacturer. He is a local guy and provides range and service ammo to several local sherrifs departments around here. I've recently started doing a bit of competition with others at some of the ranges around here. Mostly action pistol, but also some PPC courses. Some of the old timers have remarked that my glock is 'tumbling' the bullets. While most rounds leave a nice round hole, some appear to be tearing through the paper at an angle. I had noticed this at the range where I usually practice, but the targets hang from the top there, and I assumed it was because of the breeze blowing the target. At the competitions, the targets are stapled to a cardboard backer. The 23 is fairly accurate at 7 yards, but beyond 15 yards out to 25, the accuracy was never much to write home about. Now I'm wondering if I need to find another source of ammo, or think about getting a new barrel. I've tried both 180gr and 165gr from the same source with same result.