With buckshot you really need to pattern your gun to see what it likes and what it’s effective range is with each load.
For years I ran an 870 with 000 outside the house because it shot sub-8″ at 50y. But 00 inside the house because it was hard pressed to keep everything on a 12″ paper plate at 20y.
One day we were out screwing around in a prairie dog field. I had a bunch of old buck to dispose of, and it was interesting to see what each load patterned on the hillside out to @125y.
Some loads were covering a vast area, highly educational.
Paul Harrell has a number of very interesting videos on YouTube that are worth the time. Including some on effective ranges, shot size and more.