An interesting video on the use of 12 gauge birdshot for self defense. This video makes a pretty compelling argument that birdshot is adequate for close quarters type self defense. A several inch deep hole the size of a fist is nothing to sneer at. If you are only worried about close distances and penetration is a real concern this might be something to think about.
We could probably call 00 buck the standard in terms of defensive shotgun loads it's 9x .33 caliber pellets is definitely not something to sneer at. Personally I like #4 Buck Shot it typically has 27x .24 caliber pellets. I like #4 buck for two reasons. First it has a lot of pellets that are IMO still amply sufficient. More pellets means more wound channels. The reason I like this is that it increases the chances a pellet or pellets will hit something very important (vital organ or essential bone) stopping the threat as quickly as possible. Sure 00B's shot is larger with more penetration but there are fewer chances a pellet will hit that artery or bone and stop somebody. Personally I think any sort of 2 3/4 inch BUCK SHOT is a fine choice for self defense. Slugs work too if that is your thing. Right now the bag of shotgun shells by my gun are 00 buck, not the preferred #4 buck, just because when I was digging for shotgun ammo that was the first sort of buckshot I found.
I can not in good conscience endorse loading defensive shotguns with bird shot. The reason is twofold. A lot of really smart people tend to agree bird shot does not penetrate enough to be a good choice for a defensive load. Second and more significantly my concern is that we are turning a 35-40 meter gun into maybe a 10 meter gun. That it's your home defense shotgun which theoretically will not leave home is a fine idea. However when you get into a fight things happen. Both the enemy and Murphy have a role in deciding how fights go. All of a sudden you could be behind a tree shooting at some meth head with an SKS behind a big rock 30 meters away with a shotgun loaded with birdshot. Granted one doesn't want to fight anybody carrying a rifle using a shotgun but that same gun loaded with buck (maybe with some slugs onboard) can fight at that distance.
Anyway those are my thoughts on that.
We could probably call 00 buck the standard in terms of defensive shotgun loads it's 9x .33 caliber pellets is definitely not something to sneer at. Personally I like #4 Buck Shot it typically has 27x .24 caliber pellets. I like #4 buck for two reasons. First it has a lot of pellets that are IMO still amply sufficient. More pellets means more wound channels. The reason I like this is that it increases the chances a pellet or pellets will hit something very important (vital organ or essential bone) stopping the threat as quickly as possible. Sure 00B's shot is larger with more penetration but there are fewer chances a pellet will hit that artery or bone and stop somebody. Personally I think any sort of 2 3/4 inch BUCK SHOT is a fine choice for self defense. Slugs work too if that is your thing. Right now the bag of shotgun shells by my gun are 00 buck, not the preferred #4 buck, just because when I was digging for shotgun ammo that was the first sort of buckshot I found.
I can not in good conscience endorse loading defensive shotguns with bird shot. The reason is twofold. A lot of really smart people tend to agree bird shot does not penetrate enough to be a good choice for a defensive load. Second and more significantly my concern is that we are turning a 35-40 meter gun into maybe a 10 meter gun. That it's your home defense shotgun which theoretically will not leave home is a fine idea. However when you get into a fight things happen. Both the enemy and Murphy have a role in deciding how fights go. All of a sudden you could be behind a tree shooting at some meth head with an SKS behind a big rock 30 meters away with a shotgun loaded with birdshot. Granted one doesn't want to fight anybody carrying a rifle using a shotgun but that same gun loaded with buck (maybe with some slugs onboard) can fight at that distance.
Anyway those are my thoughts on that.

