My primary bird hunting guns are Browning Citori XS Skeet models, with 30" barrels ( in 12, 20 and 28ga ) depending on what I'm doing - from waterfowl to Quail.
If I travel with only 1 gun / and want it to do a little bit of everything - its a Benelli Super Sport, 12ga, 30" barrel. Its light at about 7# 3 oz ....and its a good hunting, sporting clays gun ..and Skeet gun..
My big game hunting days are over ...but it was always high caliber rifles ( .30-06 etc ) ...white tail deer, mule deer, elk, black bear primarily ...and I've never hunted deer with a shotgun / so don't know anything about it.
I depend on my handguns for defense ...in the one in a gazillion chances I'd ever need it ...its a Wilson Combat 1911 in .45 acp. I've fired a lot of tactical shotguns - but frankly I don't see the attraction. If I felt like there was a serious problem - where a handgun wasn't adequate - I'd grab the Benelli Super Sport / pull the plug out and use it --- or grab a lever action rifle probably... But I train weekly with my handguns / I'm very confident with them within 30 feet easily.