I've been using black powder in my 1889 Marlin 32-20 (made in 1893). 20 grs FFFG and a 115 gr cast bullet.
I've been searching for a smokeless load for that gun but there isn't much info online. There's plenty of 32-20 data for newer rifles, with several warnings against using smokeless in that rifle.
I have found some data using Red Dot, Trail Boss, Bullseye, Unique. Any suggestions?