This deed is proof of the old saying:
I bought a Nepalese Snider with a chamber the size of an oildrum. I wanted to tear the action of and line the chamber to something that actually looks like a .577" Snider/Boxer cartridge.
Clamped the barrel in the vise and clamped a piece of square tube to the action (nice and flat). Here's the result:
So major restoration is now called for
Unless somebody has an action they want to part with!