i have a problem. for my first gun ever my dad went out and bought me a mossberg 385-T it's a 20ga. bolt action with a 2+1 detatchable magazine chambered for 2 3/4" and 3" it is a smoothbore with a fixed full choke. my dad intended me to fire slugs from it and so i did for a while. i've recently been missin 20yd broadside shots and everyone i talk to says not to shoot slugs from that gun. I have noticed some scarring in the choke tube.so i bought some buckshot. the only size that seems available for a 20ga in my area is 3BK.

for the poll lets say the max range is 30yds