The subject of barrel length has been discussed (and cussed) back and forth since Forever. Almost always the concern is about how much velocity is gained or lost by changing the barrel length.
Most of the modern (read smokeless powder) cartridges perform very well with barrels ranging anywhere from 22" to 26". A couple (the .25/06 is one) seem to benefit from barrels of 24" or more. But, for the most part, the terminal performance pretty much stays in the satisfactory zone with all the common barrel lengths.
However....
I've always thought it would be a great idea if research was done (and published) on the decibels of muzzle blast each caliber produces in all the different barrel lengths.
A hunter whose mode of hunting entails a lot of walking - and thus a lot of carrying his gun, should really choose a light, short highly-maneuverable rifle. In doing so, though, he is increasing the blast (and recoil) - and so should seriously consider buy his rifle in a caliber with comparatively modest muzzle blast and recoil. If you've ever touched off a .308 with a 18" barrel you know it is decidedly louder than one with a 24" barrel. And if you've ever fired the old Remington 600 in .350 Rem. Mag., you
definitely understand the problem.
The hunter who spends most of his hunting hours sitting in a blind or stand and not much time lugging his smokepole can afford to use a heavier gun with a longer (blast-reducing) barrel and can choose a "heavier" caliber, if desired, with less concern about muzzle blast and recoil because he can simply buy a heavier rifle with a longer barrel. I know more than a few stand hunters who use heavey-barreled, larger caliber rifles for deer with deadly effect.
Anyway, I think it would be very interesting to see the loudness differences between calibers and between barrel lengths within each caliber.