Aren't the lands more important? don't the grooves just show how much depth the bullet can expand? For instance I have heard of people with Tokarev's who slug the barrel and measure the grooves and get a .311 or .312 and freak out saying" the Tokarev is supposed to have a .308 barrel and mine is oversized!" Ideally if a bore is supposed to be .308 shouldn't the grooves be .002 or .003 more? If a bore(lands) is .308 should I buy bullets for .308 or .309 or what?