First, since we are talking 'traditional' brush shotguns, I don't think we should be looking at Semi-Autos.
Who's talking "traditional"? I'm talking about what hunters today are using and many of them use semi-auto's, like my favorite Browning Auto 5 that has a 26" barrel.
I am talking functional. When talking about function or purpose, it is sometimes necessary to look at tradition. Seeing what something evolved from and why makes the picture that much clearer.
Semi-Auto Upland Game shotguns evolved from the classic doubles. The barrel lengths from those doubles is what carried over to the pumps and semi-auto. People tend to forget about receiver length differences.
But under your theory, that a semi-auto with a 26" barrel, is the perfect weapon for upland game... Those side by sides should have had 30" to 32" barrels so they would have the same overall lengths.
The overall length of the weapon is what is important, not the barrel length.
Look at dangerous game doubles...
a Searcy Double in 375 H&H has 24" barrels
a Merkel Double in 375 H&H has 25" barrels
a Chapuis Double in 470 NE has 24" barrels
For a bolt gun in 375 H&H to have the same overall length, because of the large disparity in action length, the barrel has to be in the 20" range.
I am more than willing to give up a little velocity, a 150 fps at most, to have a better handling rifle. Personally, for me, it is a no brainer.
The traditional african rifles and the traditional upland game shotguns have a couple of things in common...
Boith are short and handy...
Both are natural pointers...
Frankly, no offense mean but the American shooter's obsession with velocity that drives the 26" or 28" barrels on rifles.
As for Africa and longer barrels, look closely at how many of those rifles are setup and designed to carried.
You mean like my Ruger M77' in .416 & .450 Rigby that have 24 and 25 inch barrels? Or all of my Weatherby's that have 26 and 28 inch barrels?
Do you have barrel bands on all of them them?
If you look at the early British bolt guns in 375 H&H, they still had the longer barrels but all of them had barrel bands.
I doubt that the original rifle in question... A remington 700 in 375 H&H, w/ a 26" barrel, has a barrel band sling mount.
Can you imagain just how loud they would be with barrels 20 to 22 inches in length? You want loud try a ported .45-70 Guide Gun. That will leave you with a headache even using protection.
I guess we are never going to agree but my Question would be... Why the need for the Weatherby? Why the need for all the velocity?
Frankly, I'd never said that 378 Weatherby should have a 20" or 22" or even a 24" barrel.
However, considering bore vs. capacity, a 375 H&H at 20" or 22" or 24" makes sense. Actually, alot more sense than saddling it with a 26" barrel for maybe a 20 FPS velocity gain over a 24" barrel.
As for the Guide Gun, the unported ones are nice.
If you think those were extremely loud, you have never been around a braked 30-378 Wby or even just a braked 378 Wby.