Assuming that you don't currently have another in either caliber, get the .44 S&W. That is unless you are planning on using it as your primary elephant, or such, gun. If you really want something bigger, then go for it. But seriously, why would you want anything more than a heavy loaded .44? It can shoot bigger and badder loads than I care to. A 240-250 or so grain .44 slug loaded to 1100-1200 FPS is plenty for anything I would want to shoot. Call me a wuss, but anything much more than that is just painful to me. That is not the max load for a .44, so you have plenty more to go if you want. What I like about the .44 is that I can shoot .44 Russian, what I call my ".44 Russian +P", .44 Special, what I call my ".44 Special +P", and all of the various .44 Magnum loads up to "T-Rex killers". It's a pretty darn versatile caliber. I don't think you will have that much versatility with the other, but in fairness, I am really not that familiar with it. Nor, do I see any reason to be. JMHO,YMMV.
Straight-walled revolver cartridges are ALL "pretty darn versatile", and the 475 is no exception. Just take a look at the Hodgdon data. A guy can load 325 grain jacketed bullets at 800 or so out of a 6.5" barrel with 8 grains of Titegroup, or the same bullet can be pushed close to double that speed with 32 grains Lil Gun.
Lee makes a 325gr cast GC. Western bullets sells them if you don't cast.
Hodgdon's data includes a 370 grain cast bullet loaded down close to 650 FPS, or 1500 FPS, depending on what you need.
Bullet weights above 400 grains are standard. Hodgdon lists both cast and jacketed bullets at that weight, with velocities from 600 to 1400 FPS.
All this just to give you an idea how versatile ANY straight-walled revolver cartridge can be, even the big ones, with the 475 being far more versatile than the 44, because its pressure window is far larger.
