Charlie,
I know you like those big guns but I think it wasn't a 6ga with 1oz of shot, it was a 16ga with 1oz. Commonly called a "square load."
Pasted from another site:
The 16 gauge gets its number because its bore is the same diameter as a round ball weighing 1/16th of a pound: 1 ounce. A classic theory of shotshell efficiency suggests any shotgun patterns best with a shotload equal in weight to a bore-size lead ball. In shotgunning lore this is known as a "square" load.
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