I would like to know from actual operators, has anyone seen or heard of operators using 5.56 or .223 80 Grain SMKs, or 75 to 80 grain VLDs in combat? I know that that MK 262 Mod 0 and Mod 1 were used, and that the Army did field 1:8 twist barrels at one time in thier M16A4 DMRs. As a former highpower shooter, I had great success at 600 yards with the 80 SMKs. Thier terminal velocity is adequate. Any thoughts or observations?