First, I have never seen the Ruger SBH in .454 Casull. The stock Ruger SBH's, including the 'Hunter' versions, are all .44 Magnum. The only .454 Casull chambered Ruger is the Super Redhawk (SRH), and it is quite different from the .44 Magnum version of the SRH, much less the original Redhawks. I bought my .454 Casull SRH new several years ago - as my first ever DA revolver. It's purchase was related firstly to it's ability to launch .45 Colts - secondly, due to it's design & material selection. Of course, I had to 'try' .454's...
I have shot 300 .454 Casulls; 240 & 300 gr Hornady's and 260gr MagTech's. I have reloaded those cases and shot/reshot reloads ~1,000 times, admittedly at very low levels (250 gr LRNFP & 260gr JHP @ 950-1,000 fps). I have shot thousands of .45 Colts, too, although I have tired of the required cylinder scrubbing and now shoot .454 Casull cased rounds exclusively. I am a plinker, not a hunter... my targets are small metal plates at 110yd. I bought a Weaver H2 2x28mm SS handgun scope to assist my mature eyes withinn the first month of my SRH's ownership - great adjunct to my shooting accurately. A HiViz front sight replacement followed... both have withstood the recoil quite well. In fact, I can remove the sight and replace it - and still hit a 12" plate at 110yd without adjustments.
Accuracy... My best groups - 5 of 6 (I allow a flier...) within 1.5 in indoors at 44yd (Not reccomended - the blast & noise are unreal!) and 50yd outdoors with Hornady XTP's 240gr @ 2,000 fps (I chrono-ed the last batch at 1,980fps.), the 'hottest' (~2,130 ft lb KE) round of those I have shot. My .45 Colts did miserably, ~ 4+ in at 50yd. That improved to ~2.5 in - and the same POI as the .454's at 100 yd - with my .45 Colt-level .454 Casull reloads. I must assume that the SRH's barrel is rifled slowly - favoring a higher speed round. My only failure to fire has been with the Wolff replacement springs... the OEM's went back that night. I find the recoil with the 240gr XTP's to be the most harsh - still not as bad as I remember from a wood stocked 29's hot .44M recoil years ago. I shot a RB once, and did not note a reduced recoil with it - just more noise. The RB owner liked my SRH a lot better, too. Additionally, the SRH is an American made six-shooter...
You could buy a 7.5" one and shoot it first... then, if you are 'pleased' with it's performance, find a good 'smith and have the barrel shortened. When I find a deal on another one, I may just do that as well!
Stainz