some ugly work there.
as to a hole into the chamber , if the screws have good threads they wont blow as one post says. and the brass usually only has a pimple on it , making extraction hard.
had a 257 Roberts in a 98 mauser with that condition. finally got a screw the right length, honed the chamber and cured that. no more pimple.

the consolidation of the states into one vast republic, sure to be aggressive abroad and despotic at home, will be the certain precursor of that ruin which has overwhelmed all those that have preceded. Robert E Lee
~Molɔ̀ːn Labé Skýla~