Owned a 9.5-lb .460 Weatherby for a time. Straight up nasty recoil...
Good grief! A 9.5 pound .460? That is about 2.5 pounds too light!

Owned a 9.5-lb .460 Weatherby for a time. Straight up nasty recoil...
Since you specified gun, I can't claim a Pershing P1a with 660kt special weapon mated. Besides, we never got to launch it anyway. So the biggest I actually fired was a M79 40mm Grenade launcher.
I had an early T/C Contender with an octagonal 8 inch barrel in .30-30 Winchester. The 170 grain factory loads would make your tennis shoes slide backwards in the dirt.
I had a .45/70 Marlin with just the skinny plastic buttplate. I worked up a really stout load with 500 grain .458 Win. bullets so I would have something to loan to people who asked to borrow a "deer rifle" to hunt in the fall. Nobody ever shot more than 2 rounds and nobody asked to borrow it again!