CH4D sell dies, 1 inch thread diameter, they will deliver to Europe, or get the same dies from Buffalo Arms

You can use .577 Snider dies if you have them available (some available in 7/8 inch standard thread in UK) as you should not need to full length resize

Several people reload these old large cases without press etc. but if you shoot a Double you will have to put some form of a crimp on

TH44