Thanks Jack!
I started with 9mm (like most, I presume), .22LR, .223/5.56, .308, 38sp, .357 and, .45 (my new love is a Colt Gold Cup Trophy). I just had my first exposure to USPSA & IDPA and, I'm scheduled to shoot my first IDPA match in two weeks. Because of this, I'm also deep into the 550 B vs 650 XL dilemma. I'm leaning more and more toward the 550 but, as always, there are those at the club (including instructors) who are pushing me toward the 650). I cannot justify that expense nor do I think I'm going to shoot in the monthly 2,000-round category. I'll make my decision once I shoot my first match....I hope...