POI for standard Beretta 391 Trap Barrel

Does anyone on here know the POI ( beads stacked) for Beretta 391 Factory Trap barrel using a factory trap stock? In other words unaltered out of the box gun.

 

Watched a video of a guy that has one and he said depending on how he shoulders gun, any where from 65/35 to 70/30.
You really need to do a POI your self with that model gun. Just judging from pics of the angel of rib to barrel, the above mentioned POI is probably close.