(X)M855 is a horrible choice for SELF DEFENSE. Biggest reason being the imminent pass through risk.
If you're planning on going to war, THEN, it would be a great choice.
Heavy projectiles such as the 77gr SMK(MK262 MOD O) are great for extended distances. Far beyond anything that would be constitute reasonable "self defense" distance.
A 40-50 grain HP would be ideal for upclose work. Something that's going to come apart on impact, explode, if you will... minimal chance for shoot through.
I could make a list of a bunch of guns i have, or "have", or wish I had. Why would one feel compelled to provide that infornation freely? Do you feel the need to show off? Is it some immature game of oneupsmanship?
Why do you feel it necessary to list your guns?