The problem I encountered with the .434 bullets was I could not find paper thin enough to patch a bullet that will enter the bore. Thinnest paper I have found is .0015, with a .434 bullet dry patched at .438 and a bore size of .4365 with this barrel and chamber they will not chamber without patch damage. Even the old 44-90 Shiloh barrel would not chamber this dry patch combo, wet patched would as the patch shrank enough but not with this new barrel.
Sad thing is I invested in a .434 swage die set and have a mould of the same. Mabye the next barrel will have a larger bore to make use of those dies
