I got pretty lucky with my 20" blued model 92 in .454 Casull. The wood to metal fit is first rate. I replaced the ejector spring with one from Stevesgunz.com and of course it made a huge difference in how smooth it cycles.
It's very accurate too, even out to 100 yards. My only gripe is that it's hitting about 2" left at 100 yards. I've tried drifting both the rear and front sights, but my ham-handedness isn't helping. Very soon I'll be having the receiver drilled and tapped for a Williams FP sight. I have one on my .357 Rossi 92 and absolutely love it.
Another good thing to do is to replace the plastic mag tube follower with an aluminum or steel one. Stevesgunz.com has those as well.
My favorite loads using .454 Casull brass have been plinker loads with 10 grains of Unique and the RCBS 45-270-SAA bullet, which is a 280 grain SWC. I'm still working up full power loads with 320 - 340 grain cast bullets and Alliant 300MP. I'm honestly not sure I can stuff enough 300MP in the case to get up to 60kpsi.