This doesnt improve accuracy or anything, its simply to keep things clean and to keep consistent pressures inside the breech plug.
Most settle for out of the box muzzle loaders, i like to improve things and make them better.
Why deal with a dirty action when 2 minutes of your time saves you cleaning, saves your frames finish.
I play with everything i can get my hands on, Pretty soon you'll see me shooting my sidelocks with BH209 and a 209 primer! Now THAT will be fun.
So much tinkering? LOL adjusting the firing pin bushing is about all ive done to my Rifles. My dads Apex has never been modified and that muzzy shoots like an ape on crack.