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This is a good read for shotgunners. It explains choke and killing patterns. Those 50+ yard shots have a very small killing pattern.http://www.shootingtimes.com/editorial/longgun_reviews_st_headintheclouds_201002/99884#
For my lead loads all I reload to is 1200 and (maybe based on the recipe) a tad more. 1200 fps-ish is good enough for any upland.
To add to what Henrydog said, here’s an article from Tom rooster that explains it well. Tom Rooster is pretty much the smartest man in the world in regards to shotgun ballistics and lethality.https://www.shotgunlife.com/shotguns/tom-roster/does-speed-kill.html