A lot depends on the origin of your brass with regard to sizing. If it's machine gun-fired brass, then I use a Small Base sizer the first time to insure that it will fit the chamber of my several .308 rifles. After the first reload I use my normal FL sizer die.
Many High Power rifle competitors use Lake City (USGI) brass for their match loads, so accuracy is more than adequate for that. You aren't likely to win a benchrest match with LC brass, but then a .308 isn't really competitive in short range (200 and 300 yard) BR competition anyway.
Reloaded 7.62 brass should function just as well as anything else in your rifle(s). What you will need to be alert for is incipient case head separation caused by the ammo having been initially fired in a machine gun. MG chambers tend to be long and loose when compared to rifle chambers, and the brass expands to seal the chamber upon firing.
Straighten out a paper clip and make a short 90 degree bend in the tip. I file that part to a point. Insert the 'L' shaped portion of your paper clip into the case mouth and scrape it against the inside as you withdraw it. If it catches, generally about 1/2" above the case head, that brass is about to separate and you should scrap it. While this is a tedious task to perform on 1,000 or more pieces of brass, you only have to do it once (as a rule).
Using military brass isn't difficult, and that's how a lot of us have financed our hobby over the past several decades. Just be aware of what is involved in the use of military brass. Most of the tedious stuff like primer pocket swaging and checking for head separations is a one-time deal, and after that you simply process the brass as you would any other type of brass - keeping it's peculiarities in mind.
Good luck!