Also, to add another source to your research, you MUST read this website if you're doing research on carry rounds and penetration. http://www.theboxotruth.com/docs/theboxotruth.htm remember, your PERFECT round depends on situation (as walther and others have mentioned).... For most you want (in no particular order) expansion - will it expand the same EVERY time? penetration - will it penetrate through clothing and NOT exit the BG's body (anything with an exit wound means your round had too much power, that energy beyond your target is wasted kinetic energy, and a liability risk) reliability - If the round won't fire, or loads improperly it's worthless and dangerous Generally the "perfect round" depends highly on your needs and your weapon... but I'd argue there is no such thing as "the perfect" round.