Gun clubs require shot no larger than 7 ½. There is good reason for this. The only time I have ever been shot (although no blood was drawn) was at a club, now closed, where the last station on the sporting clays course overlooked the trap and skeet fields. It was far enough away that small shot wouldn't carry, but 4s did, and they stung. We were at the last station getting ready to shoot when everyone in my squad said "Ouch!" simultaneously, then looked at one another wondering what just happened. After we got hit a second time we figured it out, but by then the offending shooters were done with their round. I have also seen clueless newcomers annihilate skeet targets with 3-inch steel BBs. Yes, the breaks are impressive, but it's not a safe practice. Big steel pellet can ricochet dangerously.