I put a Bushnell Banner 6-24x40 mil-dot scope on my .223, and couldn't be more pleased with it. Depending on where you get it, it runs about $115-150 dollars. I'm not sure on if the dots are really "calibrated" so to speak in relation to the rifle, if thats what you mean by lead you to success. If you read up on mil-dot scopes, they will help you to figure out the stuff about millirans(sp), and where to hold. I mostly just use them as a way to "hold off", or as a secondary aiming point for farther shots. I have mine 1.5" high @100yds, which should put it on at 200, and about 7-8" low at 300. Then I just take a swag of how far it it, and about how high I need to aim, then put a dot somewhere on the hog that will allow for the correct holdover, and let her fly. I know, not very scientific, but it works for me.
~~~Amos