Changing guns is a recipe for poor shooting for me. I follow the recipe every year! However, I generally shoot a gun I've chosen for a particular game bird until I begin to miss...then switch. I switch often.
PH 12 cpg/splinter for home field doves
(Quality U straight/splinter 12 as the back-up for doves)
Quality 4 Bernard barreled top action 12 for early Teal
DH 16 straight/splinter for MN grouse
GH O framed 16 for home covert Woodcock (factory cylinder choke in the right barrel)
EH 32" Damascus 10 for Fall season turkeys
Grade 3 Hammer 10 for the duck opener in MO
DHE 20 for wild quail in home covers
(AH 16 as the back-up for quail)
BHE 12 #1 frame for late season Kansas/OK quail and pheasant
CH Bernard 12 for the rare occasion I go for home field pheasants
CHE Bernard 16 for February end of season Appalachian grouse