Lead shot. Cannot shoot steel out of the Belgian A5s or you risk damaging the barrel. 3 inch #4s are overkill no doubt but it allows me to deal with any coyotes that cross my path and as stated earlier cuts through the early season foilage better.
I should have added "magnum" to the description. Designed, built and chambered for 3 inch shells. In fact unless I change the friction ring setup every time I want to shoot 2 3/4 it will not cycle them. If I leave the rings set for 2 3/4 it will cycle most 2 3/4 loads (but not light loads) and will also cycle 3 inch shells when set up this way. Problem is it kicks like a mule when firing 3 inch shells with rings set for 2 3/4 and you risk cracking the forestock if you fire 3 inch with the rings set that way.