My thought about 7.62mm.

[Nightbaron]

Yeah, If Only They would polish up Their products... Too bad tho, Specialy when They seems to be able to get few things right with this game, Such as the more "reallistic" inventory/loots parts of the game... The enemy have the guns and the ammo, which means ammo def would NOT be a problem... like it should be on a war torn country/island.
( Always feels kindda awkward with the so called balancing system usually implemented with this genre, Most common scenario... Your less than normaly would equiped squad finally succeded ambushing and managed to obliterate a convoy of enemy soldiers... Just to find out that all the shinny automatic rifles the enemy used to make your life hard just minutes ago... have magicaly transformed into a pea shooter revolver AND No ammo whatsoever

Oh, And the shooting ability... atleast in 7.62 the dumbest over priced mercs STILL capable of shooting somebody 10 meters away, While in a recent similar themed game (infact actually in MOST of the game with the same genre)... Even The Not-that-dumb mercs can hardly hit a truck sized target 10 meters away, Believed or not I got more frustrated with hired guns ability than with all the crashes playing 7.62