I've put almost 2500 rounds through my XD with no jams and I'm loving it! But I have a question: The XD9 HC is marketed as having a capacity of 15+1. But the magazine is marked for 16 rounds. Also, I've found that I can actually fit 17 rounds in each of the 3 mags that came with my XD without any detriment. What gives? At the range I go ahead and load up the mags with 17 rounds to save time reloading, but at home its stays loaded only with the 15 "just in case" (I never use the +1 chambered round). Am I potentially weakening the springs, or is this normal? Thanx in advance for any info...