Well, the recoil of a 750g bullet in front of 350g of powder going 3400 fps would be about like your favorite '06.
... as long as it weighed about 200#.
A 25# rifle would give you about 200 ft lb straight in to your now broken collar bone and rotator cuff, and anything else nearby.
Mount it to your VW Beetle and it'll give just under 2 ft lb. Not bad at all, really.
And as Barnes mentioned , McBros has an action for it. Must be giant.