You would need to re heat treat it to harden the action. I believe that is what Merkel does when using their 20 Gauge action for rifles. I think you would want it to weigh in around 7 Kilos, minimum.

A lot of thrust there with the 600NE. Make sure to take pictures for your friends and family when firing.

How about a Cape Gun in 600NE and 10 Gauge?