So in the interest of science, and since Borderbill declined to do the dumpster diving, here's what I found in the trash at Ben Avery this am
20g all 7/8 oz.
Federal Top Gun 2 5/8”; Federal Target 2 5/8”; Fiocchi Shooting Dynamics 2 5/8”; Challenger Target 2 11/16”
12g
Federal Top Gun 1 1/8 oz. was slightly more than 2 5/8”
2 11/16” - Winchester Heavy Super Target 1 1/8 oz., Winchester Super X 1 1/8 oz., Nobel Sport Italia 28 gm, Nobel Sport Italia Target 1 oz., Rio Star Team Evo Training Light 1 oz., Fiocchi Shooting Dynamic 1 1/8 oz.
2 3/4” - Rio Star Team Evo Target 1 oz., B&P Competition One 7/8 oz., Federal Walmart 100 pack
2022 12g dumpster results:
2 11/16” - Fiocchi Shooting Dynamics 7/8 oz., Federal Top Gun 1 1/8 oz., Remington Gun Club 1 1/8 oz., Clever Mirage Grand Italia 1 oz., Nobel Sport Italia Target Low Recoil 1 oz.
2 3/4” - Federal Game Load 1 oz., Challenger 1 oz. Target Load, B&P Comp One 7/8 oz., Estate 1 1/8 oz., Fiocchi Shooting Dynamics 1 1/8 oz., otherwise unmarked Federal, Winchester Heavy Target
In 2020 16 gauge Aguila, Fiocchi, and Remington Game Load hulls averaged 2 5/8”