Ouch!
I shot some turkey loads in my Rem SP-10, these were 3 1/2" full power and that gun is around 9#. To me it's worse than my M-70 Super Express in .375 H&H. I shot a buddy's Merkel .500 NE, 570 gr. bullets at 2,150 fps. Big push back, but less slap than the SP-10 with those turkey loads. Only the 10 ga. gave me a headache...
DF