Mike,
Larger shot will always have more volume for a specific weight than will smaller shot.
Bizmuth is less dense than lead and will have more volume than the same weight of lead. Steel being even less dense will have even more volume.
Always load by weight. If using a charge bar measure what the bar throws frequently.
Mark
__________________
Don't hunt with a gun that will embarrass your dog!
USMC Retired
USMC Distinguished Marksman
USMC Distinguished Pistol Shot
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