So you want to experience 4 Times the recoil - to see how it'll pattern ??
If both barrels have the same Point of Impact - it'll pattern one on top of the other - but if some of the shot collides in the air - you will get a lot of "flyers" out of the pattern .....
but what is the point ....?? I guess at 6'5" and 290 lbs - I no longer feel the need to prove how high up the tree I can pee ... / or whether it hurts when I slam my hand in a car door / I can / and it hurts ....