In keeping with the theme of this forum, I ask that question. When it hits a two-legged critter, which performs better and more consistently? Let's say for a military force, not Joe Civvie.

Sure, M855A1 has some pressure issues which could make one default to Mk318, but if by some miracle increased wear on the weapon wasn't an issue, which one? Not talking barrier penetration, but I guess that should be included in the discussion.