if you wish to ignore someone that WAS ISSUED an m14 and has been shooting them since 1970 in one form or another as well as the ZEDIKER ARTICLE ON MATCH LOADS( which is the old match load for the nm14-168 grain) - which is published on the net, that is your perogative- the us army national marksmanship team, when they were using the m14 found that the 175 caused UNDUE wear on the oprod , and these guys have COMPLETE REBUILD FACILITES AS WELL as an armourer on site- they have a large cube van that goes to matches- i currently have 4- a trw, an h&r, and springfield as well as the norc- that was enough to tell me to DROP BACK TO 168 from 180 - which meant throwing out all my data collected for the 180's over 20 years and starting all over again- and the 150 grain is NOT the optimal bullet for the m14- it is the STANDARD 7.62 nato loading, which can be used for the fn in all its forms, g3, m14, or whatever- some of those receivers were STRETCHED to their design limits to accomodate the nato cartridge, and can only take the lower powered loadings- the real optimal bullet, was the 168 smk as used in match m852 ammo b/c m118 is not availble to civilians- the m118 with its 175 grain smk is really developed for the m24, as the twist changes and there is no gas system on the 24
if one was to discount the gas system, or modify it for heavy bullets, according to the greehill formula the m14 could take up to 190 grain bullets
Im just saying shooting 180's in them once in a while isnt going to damage the rod, so did shooting the 180's ruin all of your m14's then? i highly doubt it if you only went to a smaller bullet because some people told you to, and im sure those military guys put 1000's of rounds through those guns as well, could be the 175's , could just be wear on the gun from constant use, who konws, as i said, 180's arent my frist choice, i will get 150's if i can find them, but if i cant then I will with confidence shoot 180's in it once in a while:>