If you go with 777 I suspect you could get all the velocity you could possibly want.
I like to experiment, maybe load up a single chamber one of these days in the ROA and see how much you can put in there and what velocity. You could extrapolate to other revolvers.
I am not sure which is more indestructible, a 47 Walker or the ROA. ROA may (may) have metallurgy on its side but the Uberti has got some decent metallurgy and a heck of a lot of metal.
I like to experiment, maybe load up a single chamber one of these days in the ROA and see how much you can put in there and what velocity. You could extrapolate to other revolvers.
I am not sure which is more indestructible, a 47 Walker or the ROA. ROA may (may) have metallurgy on its side but the Uberti has got some decent metallurgy and a heck of a lot of metal.