Went to South Dakota for pheasant hunting last week and had a great time. My old Ithaca 37 took the highbase lead #5's just fine. Friends want me to start thinking about duck hunting but I'm guessing the old gun won't do steel shot very well. Bismuth or anything else O.K.? Where do I find out the general do's/don't's on 60's manufactured shotguns regarding shot? I'm a rifleman to the extreme, this shotgun stuff is new to me.