a scope with a 40moa total adjustment on a typical 308 will get you to 600 yards before it bottoms out. it will leave you 2.5 moa or about 10 clicks of elevation if your needing to come up for zero at 100.
just refrain from letting anyone "bore sight" for you. do it yourself so you can record how much you need to come up or down from mechanical zero.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent