Steel is a good way to break a tooth....7.5's are small and there is a lot of 'em in a load....with my 12 ga. I like 5's and either a mod or full choke ...... even out of the 20ga. I used to have 5's were the way to go, if you could find them, 6's would be the back up if I couldnt find 5's... congrats to the young guy !!