Since I already own a 22-6mm the shoots heavy 22s, the 243 AI is covered, as is 6.5 and 7, the only direction I can see to go id 20 cal for something new. After having experience with 17s I really don't think I want to go back there...Royal pain to load and clean.
How is the cleaning of a 20? The hand loading?
I would guess it's like my other BR... EASY
I'm leaning on 55 gr Bergers with the BR case... That said I own a 22 BR as well...shooting 52s @ 3700 FPs in a big heavy bench gun.
I might need to have someone else prep cases, as after the 22BR I know first hand how time consuming it can be with a hand turner, especially if I opt for a tight neck.