Cases can also be made from 500/450 N0.2, WR Musket No.2 and .476 NE brass.

The 500/450 No.2 is a Gibbs cartridge and the WR No.2 is a Westley Richards cartridge. They are not the same, but are insignificantly different and will interchange most of the time. The upside is I doubt you will find any WR Musket No.2 Brass.

I mention this as the WR carbine and the WR Musket share the same case and most references point to that.

The 50/90 brass seems to work better for me as once necked down the necks don't need reamed. The 50/90 brass is not as heavy as the NE brass.

I have also used some 500/450 No. 2 brass and it works well, no neck reaming needed.