What's your preferred ammo in the inventory for use in the M4?
MK262 Mod1 for distance, 62gr SOST for general purpose. There is ammo that is not available or used by conventional and general special operations personnel that is extremely effective from 0-500+ meters.
M855A1 is acceptable in tissue, but like M855 (Greentip) is extremely inaccurate
Yes. Precision spec for M855A1 is the same as it was for M855- 6.8 MOA Mean Radius. Note: that is mean radius, not extreme spread. It was not unusual to get lots of M855 that grouped 8+ inches for 10 rounds at 100 yards. Early lots of M855A1 were better at around 3.5 MOA, however they are getting worse and the last few I have shot were 4.5 to 5 MOA from match barreled guns, and 6+ from M4’s. Combine 5-6 MOA groups with an non-free floated barrel, and you aren’t reliably hitting vitals past about 100 from good positions. Throw a VFG on the rail and use it, or rest on the hood of a truck, or use a a barricade and you’ll get 12-18 MOA shifts in point of impact. That’s all provided you actually got a real zero. The way the Army, Navy, and Airforce zero, and to a slightly lessor extent the Marines ensures that you aren’t going to reliably hit anything between 75-300 anyways. Then combine the current general issue optics (Acoq)..... it goes downhill from there.
In contrast a properly setup M4 (SOCOM Block II, URG-I, etc) with MK262 zeroed correctly will keep it’s rounds in the vitals out to 450-500 yards mechanically.
