We use a slew of Barnes bullets because they shoot well and they work well.... not because we're mandated to do so. Don't feel like you're sacrificing by having to use a mono when there are such great ones out there.
The .277 130 TTSX is a great bullet as is the same rendition in the 150 and 168 .308 cal.
Find what works and then get a turret (if that's your thing) but I suspect the drop will be relatively close to where you are now. Just check your BC and velocity and go from there.
Zeke