i have been trying to decide on a good home defence round for my ar [20'' 1 in 7 twist], something that won't over penetrate. i see most high quality ammo runs over 1.00 a round so i want to make a good choice. i already have a couple thou 55 fmj picked up from different places. right now i'm looking at 60 grn hornady tap. is there anything else i should concider?