Okay, dumb question from a novice. Scopes have three numbers so what do they mean and folks here talk about low power scopes on 30-30s so what would that be one good for up to 200 yards or so? And what would be the max power you'd put on a 336 30-30 and a 35? And I'm headed to a gun show this weekend and in case I want to try a used one need to know what I'm looking at. Some recommends? Thanks and sorry but I'm learning and you guys are great.