I have been putting break action lugs on barrels lately.
One with 1 1/4" water pipe as a test fixture for pistol barrels.
One as a 50CB short.
I got an H&R lower for $50 at a gun show 3 weeks ago.
I am going to put a lug on a barrel for that.
I filled some 45/70 cases with steel to compress 1 gr of powder. It will push a 150 gr at 400 fps with the sound of a BB gun. It kills raccoons in 2 seconds with body shots from the side, but will not go through the shoulder from the front.