One advantage of an external adjustment scope is that it can be possible to get lots of elevation for long range shooting, while the reticle is kept centered in the scope. I bought an externally adjustable Unertl BV-20 at an auction, because I couldn't let it go at the price. Turns out the BV-20 is a preferred scope for extra long range hunting.
I have a 112 Savage that was originally in .220 Swift. You don't see many of these older single shots. The rifle was salvage grade, I rebuilt it with a premium barrel in .223, as a target rifle.