HI TAC,
I have been following this with great interest and green eyes,
i have a .54 hollow base minie mould, my .54 Hawken is smooth bore, so i do not use this,
would it work paper patched to get yours shooting or is it to small,
you may even be able to drill it out to make your flat sided bullet,
just an idea, let me know,
yours if you want it,
regards,
T