Try a 20mm lahti if you ever are lucky enough.
I did, and of all the big bore hunting belted mag rifles I have hand loaded and shot, that lathi scared the livin hell out of me. Some guy had one and invited me to try it. GD! The muzzle blast was unreal say nothing about the kick.
I have never fired anything of that size.
The highest I ever fired was 30-06. I can deal with that one, definitely packs a punch though.
My step dad had the 300 win mag, he was going to hunt bear in Alaska with this, and he was trying to set his scope one day up on the farm in South Carolina.
I was standing near him when he fired it, probably about 6-8 feet away, he was in prone position. That thing knocked me off my feet and basically sounded like dynamite going off right next to me.
He just picked up the gun, put it back in its sleeve and put it away. I’m not sure that he ever fired it again.