Years ago, I shot the 45-70 in the 12 inch non ported barrel.
This was a friends gun, I just bought my own TC just recently.
Anyways,I was very used to his 44 mag and 223.
We were working at an indoor gun range @ the time. TC nut came in one night all excited about his new 45-70 and took a box of ammo off the shelf.
Into the rifle range we had and we heard two big bangs.
He handed the hand cannon to a co worker and two shells and said, "try it"
Now Coworker already had a Smith 44 and we were always were dreaming up,loading up hotter and hotter shells.
"No prob " he sez and closed the door. One big whoomp noise and he staggers out. Blood running from a split on his forehead.
He hands me the cannon as he heads to the restroom.
By now everyone is laughing. You know the saying" Its all fun till someone gets hurt,then its hilarious"

Its now MY turn,, Im thinking" Face, dont get in the way!"

Now, Im in the closed room, hand cannon in hand and insert the howitzer shell into the breach.
Standing up, sort of aim it down range. Good firm two hand grip,face out of the way and squeezed the bang lever.
It feels like Hank Arron just took a full swing against my hands with his base ball bat !
The cannon recoiled well past my right ear!
Im Done!
Call me a puss if you want, but Im never shooting anything like that again.
Takes a bigger man then I am to want to sling a chunk of lead that big down range and call it " Fun".
Good luck with that.
