Am failing to find any bismuth 20-gauge loads in 2-3/4" shells on the BOSS site. The OP's gun probably has 2-3/4" chambers, unless somebody had them lengthened to 3", which would be a pretty dumb thing to do--though am sure it has happened.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
