I own an M4 with a non-chrome lined CMV 16" 1-9 barrel and carbine gas system. Im curious what everyone's opinion is on which is going to be the most accurate for zeroing my sights out of all the different types of ammo I own. MK318 XM-193 XM-856 tracer Winchester ZQ3313 5.56 64gr nosler bonded soft point PMC bronze .223 Tulammo .223 Hornady .223 55gr fmj brass Remington UMC 55gr fmj brass Hornady Super Performance Match 5.56 75gr BTHP (#81264) My choice would be the Hornady SPM ammo, but Im not sure if the 1-9 16" barrel will stabilize it...Assuming it does not stabilize it, which of these other ammo choices I already own should I use? Im not opposed to buying a different ammo I dont already have. Ive been thinking I should get some of the hornady SPM 5.56 in a 69gr or lighter/shorter selection. But feel free to suggest something I haven't already thought of.. If this is a stupid newbie question that you feel is a waste of time, then Im sincerely sorry for the trouble. But, please try to keep the replies to constructive suggestions or tips. Ive been berated enough over on m4carbine for asking a question that somebody already asked three years ago that I should have been intently searching for on their archives instead of being such a tremendous drain on resources and an inexcusable waste of their precious time... Thanks everyone! Wanna kill these ads? We can help!