Found the same thing with my 2007 Norc. As far as off the shelf commercial, I found the most consistent was Federal Blue Box 150 gr, followed closely by Winchester White Box 150gr....Remy core-lokt - 150 gr. 1.8" to 2.5 ". Very inconsistent ammo, wandered all over the place. Cool barrel was about 2" (3 shots). I got a case of the stuff.
Awesome, maybe sobo4303 is looking to move hisI've yet to shoot a M14 that didn't love Remington CoreLokt 150gr.