I beg to differ or argue.....The 20BR with 55's is the much better/funner choice.
I honestly think the "neigh sayers" have NO experience with the combo, and one would naturally think that the .20 caliber would take back seat. That may be the case with a 39 grain bullet...........but DEFINITELY NOT with the 55's!!
The 20BR just begs for a 55'er!!
I have a lot of experience with the combo, from targets to coyotes and would be happy to talk to you.
Just took second place in a "Steel Hunting" type shoot that included prairie dogs, ravens, coyotes, foxes....from 275 yards out to 900+ with 12 mph winds. I was the only .20 caliber shooter on the line. Most were shooting bigger boomers.....
I love the combination so much that I just sent parts to the gunsmith for a more "custom" build.
One caliber you might want to consider as well is the 20X47. Although I prefer the 20BR, the 20X47 will feed better....if that is an issue with you.