FWIW Todd Hodnett had guys that are attending his course down in Texas shoot out to a mile with whatever they had on hand (this was around 2010). He also told us it would exit a pig at that distance.
We actually pushed the M24 using 118LR out even further while I was at Ft Carson. We set a couple of AR 500 E types at 1800M and 1900M. The 1800 meter target the bullets hit mostly point first but at 1900 close to half the impact marks on the target were sideways. There were guys shooting Mk13 rifles along with the M24's so it was impossible to say which hits were which.
On a side note the daily training (week long sniper refresher training) always started with a cold bore shot. Everyone got one shot for smack talking rights more than anything. Anyhow one of the instructors had a 16" barreled SCAR17 that he took his shot with and made a 1200 meter cold bore shot on an E-type, I doubt he could of repeated it, but it sure impressed the students.
