For a regular field gun I would get either a browning or a Remington, But if you are gonna be hunting in erratic weather conditions and moisture wether it be snowing or raining or in conditions where the gun can or will get wet, You can't beat a mossberg with a parkerized finish.
I have a Mossberg 835 Special Purpose crown grade with a 26 inch barrel 3.5 inch chamber and a parkerized finish with synthetic stocks this gun you cannot hurt Its been hunting in snow and blizzard conditions has be drowned in shallow water just pulled it up dumped the water out of the barrel and fired just fine. Another time I was hunting in sleet and the tempature dropped below freezing the before wet action was now a frozen solid action when a flock of snows came over head I fired it and the percussion from the discharge broke the formed ice in the action and was back in action for more flocks of snows, One time after a hunt the gun was soaking wet when I got home I was gonna be sure to spray it down and wipe away the moisture but i forgot about it and didnt clean it till the next day and it was perfectly fine not one spot of rust anywhere. If you did that with any other brand shotgun you would be carrying around gun with a no longer nice finish but a rust finish. Everyone seems to think the more you spend on a shotgun the better it is...... NOT. A friend of mine has a Benelli you just look at it funny and it rusts like its nobodies business. If you want a great reliable waterfowl gun that will withstand punishment go with a mossberg but be sure it has a Parkerized finish or a camo finish b/c even mossbergs blued finish guns rusts like every other brand