The shot payload/speed or DE is kinda important since one could be lighter than the other. On cheap shells, I would go with the Federal 100 pack from walmart as they tend to work the best followed by remington, then winchester. The only difference is 9 and 7.5 shot is inside the shell 7.5 is a bigger pellet. I have seen the winchester promo loads at walmart from 7/8 oz to 1 1/8 oz