I have two guns with 36" barrels.
The second gun was bought on the strength of liking the first ones performance so much.
Not only me who can see how far it is that I can knock down foxes with a load of number two's.
Choked very tight & with slow burning powder they are extreme range guns.
The same loads fired from modified 28" barrels are definitely not the same in performance & there is un burnt powder left laying in the 28" barrels.

All that I have read from ballistics expert opinions does not back up my real world experience; Believe it or not.

So have @ me experts.
Believe what you like Jon, but I recommend that you try long barrels for yourself & see for yourself If I just believe they are good for long shots.
Another thing I believe is that you cannot work out the answer to this with math.

O.M