Some of our stands are tight with sides and shooting ports on them, maneuvering a longer barrel carefully takes time in order to make sure you don't bump anything, that 6" is a bigger deal than you would think.
Interesting on that shooting data. I've never seen 2750 out of that load. I'm basically at sea level with normally 70+ temps and 80-90%RH.
I marked the barrel and I think 20" will be the benchmark. I can always cut it shorter were I to decide to.