I've used the Hornady FMJ bullet. The cannelure is more appropriate to duplicating M80 ball in 7.62 NATO. I have often wondered why someone did not make an FMJ bullet similar to the M25 tracer. It has two cannelures, one appropriate to caliber .30 and the other for 7.62. Anyway, seating out has been my solution in coaxing a little more accuracy out of the Hornady bullet in cal. .30 and the Lee factory crimp die. IMI used to make a true M2 ball bullet but I have not seen any in years. Also, when pulled M2 bullets were available loading those in my M1icon gave me better results than the Hornady 150 grain FMJ-BT, even when seated out. I do not know why. I wonder if it is akin to the dislike for boattails that I see in moderately worn .303's? There is just no way to be certain if what my notes seem to tell applies to any rifle other than mine, but duplicating service ammunition and getting it to shoot really well too has mostly eluded me.