I've knocked down 12 birds so far this year...5 with Hevi shot out of a 16 gauge (#6)...and 7 out of a 12 gauge with #3 Hevi Metal...retrieved all 12 birds...no cripples to chase around, either...they were laying where they fell...now, my partner, who is a TERRIFIC competitive shooter, was shooting #3 steel, and lost 2 or 3 birds...he has good dogs, so do I...take from that what you will. Hevi metal is about a buck a shell...hevi shot is about $3-4 per shell...
about 15 years ago I was given about 70 rounds of 20 gauge Hevi shot...#6...I used it one trip...knocked down 20, retrieved 19...I was sold. I have stood in the field SO MANY times looking for a lost bird, shot with steel....I turn to my buddy, and say "I would pay 20 bucks to find this damn bird!"....therefore, $3 a shell for Hevi shot seems like a bargain! I bought 60 rounds for $150 about 2 years ago...16 gauge #6...glad I did!