I'd gotten this mold a while back to try out in a .41 Magnum single shot rifle and hadn't time to work with it yet. Out of curiosity looked it up in the RCBS Special Order catalog and was surprised to see the sizing diameter of .406". I'd thought it was made for the .405 Winchester.
Reckon not.
So what was this rascal really for? One of the .40 caliber black powder cartridges?
The lube grooves look a might small for that.
Any how, anybody have insight on this one?