There are many variables to the question of DR vs Bolt that are purely personal.....
Eyesight - Do you need a scope to offset bad eyesight?
Proficiency- Are you willing to put in the time and ammo investment to master a double?
Terrain - Are you hunting thick jess or open savannah?
I completed my first Africa hunt in July for tuskless in Zimbabwe and I can tell you that no amount of reading or youtube videos will ever accurately depict how dark the Jess can be and how well animals especially elephant blend in.
I brought my .470ne Sabatti - The pic in my avatar is a L&R group from when Ken Owen regulated it, he also did a trigger job, sights, recoil reducer, load development and milled the rib for a Trijicon RMR 1moa sight.
Before leaving in July I had fired over 250rnds of .470ne in preparation for this hunt and was confident both free hand and from sticks; as a result I could hit 8" plates at 150yds all day long while using sticks and able to hit two 4" targets free hand @50yds faster with my .470 than I was able to with my M70 .270win...... point being is that I believe that most hunting foul ups with double rifles come from the shooter not putting in the time and resources to fully master their doubles.
As for the hunt, when the time came we had our tuskless in front of us and the rest of the herd(over a dozen) all around us, as she cleared the tree and presented herself, the only viable shot was a quartering to shoulder shot and in the mental clarity of the situation my brain said.....
"This looks nothing like any of the shot placement pics"
Boom! first shot clipped a 4" diameter branch nearly cutting it in half and the bullet broke the front shoulder and into her heart, immediately I hit her with shot #2 in the shoulder and again hit her heart, reload and put the dot on her forehead and Boom - Brain shot and dropped her cold.
Distance 11 paces - The RMR was perfect, a scope would have been a liability.