I have my dad's old Model 12. It's got a full choke barrell and it shoots thee inch shells. My late father killed 40-50 birds with it. I have one more bird to get before I am limited out in GA, and I am seriously thinking of taking dad's old gun. I know he shot #6 shot out of it. My question is I have some old Federal 3" #6' laying around and I was going to see what kind of opattern It got with them. They are copper palted I beleive. I jsut wanted to make sure they were safe to shoot out of this gun. Thanks in advance for any advice.