Inherited on of these this year. It was so fantastic during dove hunts I want to use it for waterfowl. Has two barrels 26" 2 3/4" chamber marked S, and a 28" w/ 3" chamber marked F. I believe the F equates to full but can't find a definite answer. Not sure when the gun was made but the barrels are fixed choke. Does anyone know if the barrels on this gun are rated for steel shot? Anyone know the specifics on the barrel markings?