The 38-55 is a hoot to shoot. I'm the happy owner of a 1893 Marlin (DOB early '94) that I had relined w/a .375 bore. It shoots a variety of loads very accurately (clay pigeons at 100yds w/tang peep sight). Trailboss has been a good BP substitute in a number of guns. I would recommend the longer Starline brass if you're going to load 38-55. Good stuff. I run the Meister boolits in my gun, but many good moulds are available for those who want to cast their own.
"Of all the things I've lost, I miss my mind the most." A. Brilliant