I patterned my 12 ga. w/ 3 1/2 mags at 35 yards witha Briley Hevi-shot choke.
Federal Grand Slam #5 shot pattern was 27" with a bunch of flyers. Hevi-shot #5' s held a 15" pattern with relativlely no flyers.

When turkey hunting or duck hunting in GA I Only use hevishot. However I' ve hunt a lease in Eagle lake, TX for geese and can count on going through 100-200 rounds per week. When hunting flocks like that I' ll usually load my first shot or two w/ Hevi then back them up with steel or bismuth. But that' s just because that much Hevi-Shot is a bit too expensive for me.