Savage 210.
It's a 12 guage bolt action, chambered for 3" shells only. For some reason, Savage only put their s****y hard rubber butt pad on it. Having fired 3" slugs from my 870 before, I had no clue what to expect when I fired it, but the first shot was one hell of a surprise! My whole arm went numb. 3 shots was all I could put through it, and I started flinching.
I put a Limbsaver slip-on recoil pad on it, now it kicks like a 300Win mag. Still rough, but reasonable.
By the way, if you're looking for an accurate slug gun, this is it. On a life size deer anatomy target at 100metres, 3 out of 3 shots in the heart, every time (about 4moa)