this forum, http://castboolits.gunloads.com/
is dedicated to the home bullet maker.
i shoot mostly patched round ball , round ball percussion revolver & occasionally military minie.
soft cable sheathing is the best for the above fire arms.
shooting paper patched boolits & plain cast boolits at 1900 fps or above require hardened lead & a bullet that will obtruate the bore to prevent by-pass gases from melting the bullet as the gases by-pass which is one cause of leading.
you can research all you need to know from the cast boolits site. common knowledge is only soft lead leads the bore but incorrect bullet size or too hard lead will too. also leading at the breech or near the muzzle will tell you about your lead hardness, powder charge & bullet size choice .....if my memory is correct.
if i knew more i'd gladly share but don't want to steer you wrong, check out the cast boolits site...... lots of stuff there....