A twelve pdr 4.62 bore napoleon cannon in shootable condition will fire a blank charge of 1/2 to 1 lb of cannon size powder( many shooters of large cannon purchase 1FA or 2FA blasting powder in 25 lb bags from a licenced explosives dealer) placed in a thin sandwich bag and wrapped in aluminum foil. It will make a hell of a roar and give plenty of satisfaction. Please contact the U.S. Field Artillery Assn. at Fort Gibbs Ok. for further instruction and safety training. Good luck with your piece, and keep the high ground! George. :hatsoff: P.S. Sounds like a good deal on the piece, be sure to check the carriage for hidden rot, insect infestation, etc. AND please post us some pics! G. :grin: