I think 7.62mm weapons are pretty decent now. We shall see.
Ok we can compare :>
Both miniguns shot 10 bullets so we can compare only 1 bullet average damage done for calculations to be easier
M60 - 18 - 26 damage so 22 average damage. 7.62 mm increases it by 11/10 amount and -10% to dr so we get total average damage for one bullet which is equal to 22 * 11/10= 24.2 + 10% from dr so 26.62.
LSW - 20 - 30 damage so 25 average damage. damage is increased by -20% dr from 223 ammo, so 25 +20% from dr is 30.
So both guns fire 10 bullets, lsw does 3.38 damage more on average (and 33.8 more per one burst) then m60, and m60 bullets are harder to craft. So you still think people will use m60? :>