I had an opportunity to purchase a TC Encore rifle barrel chambered in 45-70 Gov't on the cheap from a fellow forum member back in 2017. I had always wanted a 45-70 single shot pistol (I like recoil lol) so I decided this was my opportunity. I had a spare 30cal muzzle brake laying around so I figured I would modify that to work. I took a deer with it in the winter of 2017. It is fun to shoot and handles full power loads surprisingly well. Barrel ended up at 13". Now every time I see a big bore rifle Encore rifle barrel come up for sale on the board I get the itch LOL! Here is what I came up with.
Indicating Bore
Checking Threads (not sure why the pic is upside down, just turn your computer upside down to see it!)
Threads Cut
No pictures, but the muzzle brake was threaded on and bored all in the same setup.
Finished
Compared to 500 SW