Thread: 577-450 case forming

Originally Posted by rambo-6mmrem

Just a note i read online is that these reformed 24g shells ave quite a bit more case capacity than a original say kynoch case
So it is possible to over load them not that that matters too much with black powder
But ideally you should use the maximum of the original charge or lower and fill the rest of the case with filler weather that be wads or corn meal or something

I would be a bit more specific with that advice.

Alot of blackpowder cartridge reloading tips relate directly to straight walled cases like the 45/70 not bottle necked cases.Where by any kind of filler wont have to be compressed upon firing as it goes from the case size below the neck to a much smaller diameter through the neck,then a even smaller diamter into the bore.From personal experiance using loose fillers like Corn meal or dried coffee grounds you can get a whopping ovepressure if you are unlucky as it can get compressed into a solid shug. Kapok,cottonwood,raw wool,or my favourite foam backing rod are safe and cheap alternatives to loose fillers. Remember to keep your wads in the neck too,they can fall onto the charge more often than you think.

577/450 in a Martini Henry is hands down my favourite black powder cartridge.