Hello folks

[Geezer]

Thanks fellows. First question. Been reading some on BP cartridges and find that some loads need filler. Haven't assembled any yet but have found that 65 gr. of black powder doesn't leave enough room for a 405 gr. bullet. Why filler? and do I need a wad over powder. I'm trying to duplicate the original load for 45-70 carbine. Thinking it won't be as rough on my old rifle. Am I barking up the wrong tree here? Also just for my own head.......can I substitute GRITS for the cream-of-wheat as a filler? Cream-of-wheat is hard to come by here in GA.