I think you are getting carried away...
Why in the world would you want to walk thru a swamp with a rifle??? Are you going after Sasquatch??? I think you have been watching to many War movies.... I am in the Military, and you Keep it out of the water at all costs. If you are hunting in the fall, why would you walk into a cold swamp? Go around it.
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I've crossed quite a few swamps carrying a rifle (carrying anything from Swedes, Garand, K98, AR15). Sometimes when walking in the bush you just come across an area where you gotta do it if you want to keep going. Some got too deep, had to turn back, some you can cross - albeit carefully, especially the first time. On a hot day in the summer a swamp can be a nice place to cool off when wading through waist or chest deep. - really. It's actually fun to take newbs for swamp crossings, especially when they thought you were joking when you told them BEFORE the outing what they should expect. Had one self professed experienced moose hunter come out for an excursion in high top runners.

Kinda funny when his runner came off in waist deep swamp and he had to try and find it under water sucked in the mud - took a awhile. It wouldn't have been fun walking back if he didn't find it.