Years ago inherited my g-grandpa's 12g DBLs, wire twist BP gun.
Someone in family had removed firing pins to keep it from use
with smokeless. I made pins for it and literally "hand" loaded a
box of shells for it. Used TP fore over the powder wad. Bro and
I decided to take it squirrel hunting, each shoot a couple with it
then retire it to the wall. Shot squirrel out of grapevines and the
TP burning set vines on fire. We spent a 1/2 hour jerking vines
down and stamping out fires. Use caution when using TP for wad.
I believe we were using Charmin but you don't have to use the
good stuff.