[Elsie]

In terms of 00 buckshot size, they are .330 inch in diameter and are the most commonly used size.

Due to the stopping power it offers, it's also one of the most widely used types of buckshot ammunition for home defense. 00 shot sends nine large caliber pellets flying at over 1,300 feet per second, and is powerful enough to go through car doors, metal panels and whatever else you may be shooting.

 

 

https://ammo.com/bullet-type/00-buck

 

Today, low recoil and coated shot make 00 buck a great choice for home defense.

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In case you were wondering... 

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You'd have to empty your Glock clip to send as much stopping power down range versus ONE 00 buck shotgun shell!

 

https://www.google.com/search?q=00+buckshot+9mm&tbm=isch&ved=2ahUKEwiwtp6czOrpAhXIJ6wKHVpeC2kQ2-cCegQIABAA&oq=00+buckshot+9mm&gs_lcp=CgNpbWcQAzoCCABQhkRYwk5ggVdoAHAAeACAAXWIAYQDkgEDMi4ymAEAoAEBqgELZ3dzLXdpei1pbWc&sclient=img&ei=xy_aXvC2BcjPsAXavK3IBg&bih=655&biw=1366#imgrc=HkiPACZl57dRmM

[Elsie]

(Using BOTH barrels; of course...)