just to add my 2 bits...
I have never had the loading levers on my walkers fall down... that could be because I use a strap of leather to tie them up.
As far as pressures for the ROA, they are rated to the level of Ruger Vaquero frames, so, have fun!!! (20Kpsi is what I believe they are tested at, which is 20% over 45lc at 17Kpsi and then some)
I was told there is not enough chamber capacity in original cap-n-ball revolvers with either a conical or round ball over the powder that could cause WELL MADE cylinders to fail.
FFFg or FFg is all I ever shoot anyhow. (I am using up all my Pyrodex P, RS, and Select in my 44-40 and 45lc cases with big lube boolits)
With that said, all your doing is wasting valuable powder, as anything more than about 30-40gr of FFFg is not going to change the point of aim at CAS shooting distances...