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.
Very interesting. I figured that the brass would flow into the hole, and completely prevent extraction.
The gunsmith didn't drill into the chamber on this rifle, but I've wondered what could happen if he did.
