As a matter of fact I do. I also have the FA with a 6" barrel. I use the Cast Performance 420 WFN, Speer 400 GD and the Hornady 400 grain XTP. I have played with the 325s, but they make my revolver recoil more like a .454; a very whippy recoil. Based on my shooting experience with this cartridge and my conversations with other .475 shooters( including John); I believe 400 - 420 grains of bullet weight to be optimum for this cartridge.
I shot a cow elk last October. You are welcome to go over to
www.handgunhunt.com for the story. I also have a photo of one of the two bullets I recovered. A friend of mine used his .475 with factory Hornady 400 XTPs and also killed a cow elk. Another friend on this hunt took a nilgai with a 420 hard cast and shot an aoudad with the Speer bullet. I had one bullet travel almost the entire diagonal length of the cow's body. Broke the left rear leg and front right leg. We recovered the bullet under the hide. Larry's 400 Gold Dot disentergrated on the auodad. Still don't have a reason for that. I have shot several whitetail deer with this round. There is no difference I have been able to tell between any of the above listed bullets on deer sized game.
I have two loads which I really like. One is 8.0 of WW231 behind the 420 LBT for a velocity of 850 fps. This load is very pleasant to shoot and will kill most anything one would run across needing to be shot. My other load is 25.0 grains of 296 behind any of the aforementioned bullets. The Speer travels at about 1270 fps and the Hornady and LBT between 40 to 50 fps faster in my revolver. These are noticeable when touched off. 22.0 grains of WC820 (mil-surp) powder gives me 1312 fps with the 420 LBTs. I plan to go to this load as the powder is relatively cheap compared to WW296. BRP sells bullets for this caliber as does a few others.
Hope this helps.