Any reasons n your using brass over plastic hulls? I have 10 brass hull but they are pretty much for show. I use mostly cut down plastics with both plastic wads and fiber/cardboard in my 1870s Forsyth. I use a 10ga Mec Supersizer and I modified a Mec 600 to load short 10s so I can either roll or fold crimp them.

After the first shot the rest are just noise.