SETTING GUIDE The lower the number, the less gas it allows into the system. Setting #1: is normally used for all 3 inch shells and some heavy 2 3/4 inch. Setting #2,#3: are normally used for all heavy 2 3/4 inch buck shot slugs. Setting #4,$5: are normally used for 2 3/4 inch high brass bird shot hunting loads. Setting #6: allows the most gas into the system and is normally used for the low brass shells. These settings may vary depending on the ammo and the firearms.