In the day there used to be square shot...this was made for very open patterns for close in shotgun work. No pellet is perfectly round, however the more uniform they are and in the case of steel the smoother and rounder they are the better they perform ( many years of patterning and experimentation led me to this conclusion).
For you Jim I can give ya a deal on some good shotgun shells
Beings my steel will perform as well as Hevi at reasonable shotgun ranges, my premuim 3" 12ga handloads should sell for 30$ per 10 rounds.
My prime early duck load is a 1oz #5 2 3/4" shell at 1600fps. It costs me about 8$ a box.
My late season cold weather mallard load is a 3" 1 1/8oz #3 steel load at 1550. And my goose load is that same load in #1 steel. They cost me about 9$ to 10$ a box to load.
My public hunting area, late season, goose load is a 10ga 1 5/8 oz #1 steel load at 1375fps. And or 1 1/2oz #1 at 1500fps. They cost about 12$ a box. Of course those prices do not include my time to painstakinly weight each powder and shot charge.
The shot that I purchase is either zinc coated and is very round and uniform, or BP's polished steel which is very smooth and uniform...premuim shot for premuim loads.