I know a little about upland bird, or pheasant rather listening to my grandpa y’all about many years ago. He was always on about a good dog breed, his favorite was springer spaniel. He used a 20 gauge for pheasant light bird shot, target load I think but he used a 870 with half choke. I’m not sure if the 500s are choke but I know the 590s aren’t. Not sure if this helps but it’s what I know.
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