Thanks for the info.
I will sear for those powders but I have Unique and some local shotgun powders.
Im write if I look for a goos 36 grams load?
My gun have 70mm chamber (2 3/4").

Have you try roll crimp with RB? I have roll crimp facilities only.

I measure the barrels:
Right: is perfect, cilinder.
Left: cilinder up to 20 cm (8") from the mizzle, then is bigger (do not know how much) for 10 cm (4") and finally choked for 7 cm (3").

I think it owlud be ok if I enlarge the choke enough to allow my RB pass and probably cut the barrel a little.

Thanks
Martin