well everyone has their opinions. the load you refer to in the .44 mag and the 454 are buffalo bore loads, the .44 is no good in anything but a ruger srh because the bullet is long and the .454 round you refer to is stated as being not loaded to max. that .44 mag round is right with any of buffalo bore .475 or .500 linebaugh loads. the velocity advantage of the .454 is not a big deal on anything but trajectory unless you have expandable that will hold together like the barnes bullets. shooting mild 250 barnes loads out of my .454 10" at nearly 1800fps and the hotter corbons at nearly 1900fps chrony'd sure do make more of a thump than any .44 mag round i've shot and to be honest, more than the hardcast out of my .475. of course that bullet expands to over an inch and retains over 99% on the ones i've shot into sand/gravel piles, never recovered one out of an animal. lynn thompson shot a white rhino head on with a corbon penetrator out of his .454 and the bullet exited the rear of the animal, not sure how much more penetration one could want or need but the .454 shines with it's versatility. i load it up with a 250 hardcast to 950 fps for the kiddos on deer. i routinely shoot 300 gr hardcasts out of my 7.5" barreled 454 at 1200 fps and they are very very mild and much less snappy than the equivalent .44 mag loads. i sold my .475 b/c i was dealing with 3 kiddos shooting pistols and being very very much interested in them. a .475 shooting a 370 grain hardcast at 1000fps still had too much recoil for the 12 year old to enjoy but a .45 colt blackpowder equivalent load is a snap in the .454 and will kill any deer just as dead. gives them alot of room to grow.
then we could get into some of double taps loads. 400 grains at 1400fps and 360 grains at 1500fps. 335 gr at 1600fps, well they stretch the limits of what a hardcast could and should do but they're there. that versatility is why the .454 is where it is and the others are where they are. they all have their place and if i were 65 and didn't have the eyesight i have and was a touch more recoil sensitive i may have gone and stuck with the .475 but as it is my .454 will kill anything the .475 will and gives me soooo many more options. my 10" barreled FA is my deer and elk hunter with fast light grained barnes and FA softpoint bullets. my 7.5" is for running nice mild heavy hardcast rounds out of it and i use it for buff and hogs. i also have a .45 acp cylinder for the longer barreled gun which makes for some great practice even my 9 year old can enjoy. to me, for what i shoot and the bullets i do it with, the .475 doesn't really add anything and to truly eclipse the .454 imho it has to be loaded to what ends up being just an intolerable amount of recoil. but we all have our limits. there's those that may feel a 50AK is just the ticket in a revolver, i am not one of those, that to me is a novelty. my .44 mag loads truly just don't hit as hard as the fast expandable 454 loads i shoot which doesn't matter on deer but i get raking pass throughs on quartering away shots with the barnes loads and even with 300 grain xtps and my elk have fallen "right there" after their shoulders get broke on the way out.