I am fully aware of all you stated. I have an X-frame 500 Smith and Wesson and do not hand-load. Buffalo Bore 500 JRH brand is what I will purchase and use in my double-action revolver. I would prefer 500 Smith and Wesson magnum brass cut-down as I want all empty cases to eject with authority, when the revolver is inverted and the ejector-rod is activated.
A moon clip set-up would solve the issue of uniform ejection definitively, but that is cost prohibitive for me at this juncture. All sauce for the goose as the saying goes.
I only responded to your double-action comment because he stated that he has a BFR (and the BFR was cut for the bigger rim). Don't read more into it as there was nothing more to it than that. And, I don't doubt your experiences.
On another note, my X-frame never experienced ejection problems with either brass, but I rarely put .500 JRH ammo through it as I have other revolvers for that and well, it's a .500 Smith, so why put up with the bulk unless you're shooting full-length ammo, but that's just me!