I like 15 of Green Dot 7/8 oz Shot Downranges DR 16 wad in Herters Cheddite hulls. I can use the same in Remington RGL hulls but good clean ones are hard to find. I buy the Herters 1oz loads under 60 bucks a flat shoot them in a M 31 pump, then reload the hulls for my SXS guns.
Use the load in a Parker Trojan 6 lbs 10 oz and a FN Hammer gun that weighs 6 lbs. Your 21 probably weighs more and could handle 1 oz but why ? Skeet 3/4 or 7/8 oz breaks just fine and much easier lomg runs 100 plus shots.
William
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