I am considering the HP carbines. Which would you buy, and why? The calibers don't matter to me as I own something in all three. I am talking SHTF. What's the differences in the range between the calibers. How do the Promags do? I have some in 9mm for my Glock. They work great since I replaced the wimpy Promag Spring with some 5%+ Wolff brand springs. BTW will the 15rd Promag fit my JHP45? LET THE FRAY BEGIN!