Marshall,
Do you know about the Havester 50/40 Crush Rib ? I had to use it to be able to shoot 50/40 before I lapped the barrel in the Triumph out to .500. I have a buch of the and could slip a half doz in an envelope and send them to you so you could try them with out buying a bunch. If you want me to PM me with your sddress. Lee