This is an RFI going out to the members here. I currently own a 21 SF that I use for general carry when I'm Stateside. There has been a lot of talk here about the various self defense ammo types, HTX, frangible, and all the others. Does anyone know of any side-by-side comparisons of the various types? Site pointers? Personal Experience? Personal preferences with explanations? Thanks. Wanna kill these ads? We can help!