Different bullet weights don't lead to more or less accuracy. Cartridge consistency leads to accuracy. I can handload the crap out of 62gr and it'll be way more accurate than some 77 grainers that are just thrown together. Higher bullet weights just usually have more forgiving B.C.'s. But since I think you were referring to mil-surp stuff than yes I would agree that it's probably not consistent enough to be "accurate".
That's what I was alluding to but apparently that got lost in translation. If people want to throw away money @ .75 to 1.00 a round for "armor" piercing ammo instead of feeding their kids or getting new tires for their car with 2 spares on it then so be it. At .30-.35 cents, M855 was a good deal for plinking. At the current price though the money would be better spent on Match ammo where 2/2.5 MOA would be unacceptable. At the end of the day, it's their money bro so they can spend it how they choose.