Quote Originally Posted by enfield2band View Post
Your load development sounds interesting I look forward to seeing what you settle on.

Brass cases seem to be a grey area. When I was in my teens I saw Eley .410" cartridges made of brass that were crimped.
I get the impression that the ones that are bought to day are intended for blackpowder because they do not have a crimp and are sealed with a top card and waterglass, (Not Isinglass), or any other similar substance to hold the card and shot in place.
Blackpowder being an explosive does not need to be held back momentarily like smokeless powder to achieve an effective burn,so, nitro powders might not perform too well in a plain brass case. A shotgun cartridge with a weak crimp allows the charge to start moving while the outer area only of the nitro powder is burning and it funnels up the barrel and when it exits the muzzles it burns fully. It is known as a "blooper" because of the sound it makes, and the shot just falls to the floor. I suspect the same will happen with the brass cases when using niro powder.
I'm happy to be proved wrong, but it might be an idea to look into it before parting with your money for something that might not work.

Atb.
It'll be interesting right enough. The rocky mountain brass has a true .410 ID and takes a 209 primer. In theory you could use standard plastic wads etc. but as you point out the charge needs holding back momentarily, so without a crimp that holding back will have to be enabled through the friction of internal components and the shot it's self. Unless of course one employs a crimping die. I've a pal thats offered to make me a die but he reckons a tight wad and hotter primer set over the relatively slow 410 compatible shot shell power will have much the same effect. We'll see.

I don't have any data for brass cases as yet but yeah, I am looking into it.