I consider my max range when I get less than 5 pellets inside a 10 inch circle or an 8 1/2 x 11 piece of paper (on it's side)...
With my Browning B-80 I'm good to 40 yards with my improved cylinder and Winchester Supreme 00 buck in 3 inch magnum...
With my 1100 and it's smooth bore deer barrel it's 35 yards and Winchester Supreme 2 3/4 inch and #1 buck...
With my 12 gauge double it's 35 yards with 2 3/4 Winchester Supremes 00 buck in the full choke barrel and Winchester Supremes #1s in the modified barrel...