it looks like a 44 magnum or 44.40 cast lead bullet, both have the same diameter , the difference was in the casting and gas checks , important with the speed the bullet is driven out the barrel, the concave base suggests a copper base plate was fitted to stop the hot gasses from melting the bullet while its on its journey down the barrel, those rings around the bullet held the lubricant, the 44 is around the 11mm diameter and more than likely be around the 200 grain weight, the weights with firearms are expressed in grains not grams, because its a more precise measurement, there is around 15 grains to the gram, the flat nose was used in lever action rifle and not a pointy bullet, there was the possibility a pointy bullet could accidentally set the primer off with the next bullet loaded in the tubular magazine, my guess the bullet is a 44.40 winchester round, .44 diameter with 44 grains of black powder driving a 200 grain cast lead bullet with a copper gas check, HH projectile could be a 38 or 357 cast lead pistol bullet, similar to lesgolds handful, there used to be a bloke at St Marys making cast lead bullet under the name of TOPSCORE he has move up queensland way its really fascinating to see how they are commercially made.
A true story, a bloke was complaining about the inaccuracy of his hand loaded bullets in a 222 calibre, what are you using ????, oh !!!! 24 grains of 748 ball powder ,, mmmmmmm ok are you using a powder thrower or a dipstick hhhhhh??? no mate counting out 24 grains its a pain in the backside, the gains are so tiny ,,,,mmmmm , some then advice given on reloading , mate was he a happy beggar next time I saw him on the range, tackholer accuracy .
muzzle loaders are just that , loaded from the muzzle , pour the black powder down the muzzle, fit the cloth patch over the muzzle , place the slug on the patch and ramrod it home carefully so its nicely seated in the breech area , pull the hammer back place the firing cap over the nipple on the breech point at the target pull the trigger kkkaaboommm, lots of blue smoke, mine is a 58 calibre, if the hammer is back in the cocked possy oooppps warning warning, too much powder, i have seen shotguns and muzzle loaders in action, pretty good accuracy, no brass cases used in a muzzle loader
