I had an Alaskan in 454/45 Colt. You do lose a lot of velocity in the short-barreled 454. My handload with a CP 335 WLNGC runs 1428 fps from a 7.5" SRH, but only about 1174 fps in the snubby Alaskan... and yes, the recoil and blast are extreme even though my handload is not really a full-on max load for the 454. Max loads run 55,000 psi and on up to 65,000 psi.
My thinking is this: why would I run a snubby 454 with a 335 @ 1174 fps when I can run the same bullet at 1211 fps from my 5.5" 45 Colt Bisley Blackhawk with considerably less recoil and muzzle blast?
I sold the 454 Alaskan and would love to pick up a 4 or 5" Alaskan in 480 Ruger. When it comes to really big game, I put a bit more stock in the TKO formula (which takes into account bullet diameter as well as velocity and bullet weight) for gauging killing/stopping power than the muzzle energy calculation.
Look at this:
30-06, 180 grain bullet @ 2700 fps = 2913 ft. lbs. muzzle energy.
480, 400 grain bullet @ 1200 fps = 1279 ft. lbs. ME.
454, 335 gr bullet @ 1500 fps = 1674 ft. lbs. ME.
But the TKO (Taylor Knock Out) runs like this:
30-06: .308 x 180 x 2700/7000 = 21.4 TKO
480: .475 x 400 x 1200/7000 = 32.6 TKO (48,000 psi)
454: .452 x 335 x 1500/7000 = 32.4 TKO (55k - 65k psi)
This current offering, although stamped on the right side as an "Alaskan," is not really an Alaskan as it has those ugly integral scope base grooves in the frame. I also think that skinny barrel looks out of place on such a big bruiser like the SRH.
I'll wait and see if something more to my liking gets produced but I'm guessing I'll end up cutting down a 480 SRH to about 4.5" for my Alaskan fishing partner.