Ed i am just wondering just where the 62,000 psi comes from. Milspec is for 55,000 with the m197 high pressure test loads running 70,000 psi. the m855 is the highest pressure of any 5.56x45 load other than the high pressure. Except the restricted range plastic bullet loads most of the rest of the milspec loads are around 52,000 psi. All this is as of 1994 mil-spec. Maybe they have upped the pressure since then but the m855 is speced to run 3025 fps 78 feet from the muzzle. You can find all this info at everyspec.com.