so i have this egyptian snider smoothbore in 577 chambering. i have some 24 gauge plastic shells on order and have calipered the bore at .589-.590. i am looking for a .585 round ball mould and came across the .585 REAL mould. assuming black or triple 7 or unique powder, and the bullet thumb loaded into the shotshell case and topped with grease if black or triple 7, comments on using a .585 REAL in a .589 bore? assuming unique or green dot and no grease, comments? i am aware that black or trip 7 will build up in bore, and become problematic in rifled guns. this is smoothbore, so a size for size seems good to me. ****ed old gun with shotgun type barrel assembled by some egyptian dude, married to outdated english made breach and lockset.
also have .600 round ball mould but am hearing that this diameter in case may not chamber (depends on gun). thoughts on pushing a .600 ball thru a .590 barrel? wanted to use a ball as this is lower weight than a conical, but cannot find a .585 mould and think a .575 would be loose till you get 3-4 fouling shots with black, and forever loose with shotgun powders...so all over the place.
i am also toying with the idea of using shotcups and .575 minnie bullets.