Good luck with that Rossi. I have one and it is a slick shooter, but is a really short gun will only hold 9 rounds. However at those long ranges Wild Bunch shoots, much like CAS, anything that will push a bullet out of the barrel will work.
When I (seldom) load that fad smokessomewhatless stuff either Unique, Titegroup , or Trail Boss and a 160 or 180 grain bullet will work just fine. Trail Boss and Unique are better because they are bulkier in that cavernous case than Titegroup.
Yr' Obt' Svt'
Bunk