I know my BT100 is close to the 60/40 POI. I never have patterned the gun, but after shooting a 682E unsingle I never realized how "flat" my BT100 shot. I swear I was shooting 10" under the target at 16 yards with the Beretta and the owner told me it was shooting much higher when he first bought it. My BT100 I touch the target with my bead before I pull the trigger.
If I set the comb to see a figure 8 sight picture...40/60...I had to take the comb to the limit in height to get a 70/30 with .5" between the beads...sold it because I just didn't want the hassle of making taller comb posts as I'm most comfortable shooting a 90% high gun
Any gun I purchase gets the POI changed to 90/10. My BT100 Stainless is there, The beautiful 870 Comp. I have is right there, and all three barrels on my XT combo are there. I have not yet had to use a backup gun on a registered shoot, but when I do I will know right where the POI will be. Bill