ever notice how most shotguns were made with 28" bbls?
now its mostly 30"?
gun makers make bbl lengths to match the current ammo trends, so all guns will get the best performance with current MV of modern ammo.
note too, that recent trends show typical ammo MV has increased to 1250 to 1400+, where it use to be common to have 1195 or 1200. see the trend?
as mentioned, changes are so small, its not really noticed, unless you are a migrating goose hunter who needs to shoot way up there and needs all the MV they can get. and, look at that, old goose guns have 34" bbls.
its always best to get a bbl thats burning powder to the tip of the muzzle. short bbls do indeed allow some powder to exit unburnt, but again...not very noticeable. dont believe me? shoot it at night and watch the sparks.
hope this helps.
