Y'all are nuts!
In the '80s, when I was 'smithing at Tamiami Guns in Miami, Thompson/Center introduced their first rifle barrel for their single-shot Contender.
I was .30-30 and we had a customer who just had to have one, but when he mounted it the gun misfired at least half the time!
It turned out that the Contender's hammer spring was not strong enough for the rifle primer's thicker cup. T/C did not have a replacement spring available and our boy wanted his new toy to work NOW so I modified the spring as a temporary fix until the new ones would be available.
The rub, however, is that misfire repairs MUST be properly test-fired, so I grabbed a box of factory ammo and headed for the high-power range in the back. DAY-UM! Even with a shooting glove that thing kicked like a mule, and five rounds later I had had enough.
Don't get me wrong; I'm no wimp. I have had numerous maggies and I love them all, but even the "lowly thutty-thutty" puts those guys to shame!