Shotgun Ammunition Question

[Nightcrawler]

I don't know much about shotguns, and the myriad of shotgun ammo out there is puzzling. How does the system work?

What's the difference between 00 buck and 000 buck? I'm guessing it's the size of the pellets, but how does this numbering system work?

 

[Dave McC]

Bird shot: The larger the size number, the smaller the shot.IE, 8 shot is smaller than 7 1/2.

Check the archives, I'm sure there's a few threads about this...

 

[KA3N]

Here’s some info from the Federal Cartridge Website:

Shot Size:
http://www.federalcartridge.com/a03p12.html

Pellet Count:
http://www.federalcartridge.com/a03p11.html

 

[jhunnetaz]

http://www.firearmstactical.com/briefs10.htm