I use Federal® #1 Buck in my 16ga SxS; Remington® #3 Buck in my 20ga SxS. In my 20ga Mossberg® 500 pump I chose Federal® 3" Mag #2 Buck.
Only two defining forces have ever died for you:
1. Jesus Christ.
2. The American Soldier, Sailor, Airman, & Marine.
One died for your soul, the other for your freedom.