Splitting hairs, yes. But since you asked. You have to determine how much cylinder will be left after the barrel is threaded. Some may thread it as is, some may chop off an inch or two, which would change changed where the muzzle ends up at 22”. In Bartlein’s a case, both barrels have 3” of cylinder, followed by 2.5” of straight taper, terminating at a .9” diameter neck. From there the med Palma tapers at .003” per inch, and the light Palma at .006” per inch. For future reference.
If none of the cylinder is cut off prior to install, a 22” med Palma will be .850, and the light will be .801.