[Redbob]

" A typical box of shotgun ammo holds five — that’s right, FIVE! — cartridges."

That's true of slugs and buckshot only - any other game or sporting loads are available almost exclusively in boxes of 25, as (almost) everyone knows...

[ought-six]

“That’s true of slugs and buckshot only - any other game or sporting loads are available almost exclusively in boxes of 25, as (almost) everyone knows...”

The poster was not referring to birdshot or skeet loads. He was referring to ammo for survival. Slugs and buckshot are for survival; birdshot and skeet loads are just for pissing someone off.