I guess it depends on what the mission for the round ball load is. I was given a whole container of .530 round balls cast out of WW's,guess they figured out in a hurry they don't go down a ml barrel worth a damn. The do fit nicely in the shotcup of Fed 20 ga S1 wads in a Fed hull. They were bedded on the bottom with Grex and another layer between the 1 st and 2nd one smaller amount on top with a thin tissue over shot wad crimped well. The total payload weight was right at 1 oz. As said above I started the powder charge off of a given one for 1 oz loads. I used the Imp cyl choke tube in my 26" barreled M870 Express with 1 chambered and 4 in the mag you can hold all 10 balls on a paper plate at 30 yds and do it in 3.5 seconds or less if your manual dexterity is up to it. They don't bounce off of rr ties like buckshot. Velocity around 1175fps ,I thought if'n a guy had to clean out his hallway this load would gett'er done. Magnum Man
