I fired three brands of 230 gr ammunition yesterday at 15 yards. Started with Ultramax, the lowest price ammo from Dick's. The pistol fired reasonably well, centering most of the rounds a bit left of the bull. I switched to Independence 230 gr jacketed and ended up with holes all over the target. The results with the independence were so bad I switched to my GP100 and MKIII 22/45 because I thought I was having shooter problems with the PT1911. A fellow at the range sold me a couple of magazines and a box of Winchester ammo for $20 and I tried out the mags. The independence was all over the paper, but his Winchester put a 5-round 1.5" group on a target. It's hard to believe that the ammo made that much difference.