DD, that is an option if it comes to that.
Do you have a link to TJs and John Taylor?
I have brass of course for the other rifles. I did notice that some of the cases I loaded which didn't fit the Hughes did drop right into the Westley chamber. A chamber cast will reveal what is going on there but I won't be surprised if there are little differences between the chambers of this rifle, the Hughes and the 1869 Westley.
I do have a Ron Snover Metford barrel which would suit this gun, but it is reserved for another project.