I need to do more shooting to double check but I think I got the omega scope with BDC figured out for the .410, 410 gr no excuse and 90 gr pyrodex. I couldn't get a 100 yd zero to work but with 3 1/2 inches high at 50 I get a 125 yd zero , between first and second circle for 150 , bottom of third circle for 175 and bottom of last circle for 200 . A total of about 22 inches of drop it appears . I still need to keep shooting but this is as close as I've been able to get to be able to use the BDC scope
on this White