This is a Specialty round!
Just like the CCI 22 "rat shot" (as I've always known it by) this is a specialty load for dealing with critters on the back portch and such prrimarily.
One thing I like better about the Federal #12 shot round over the CCI #12 shot is that the Federals are crimped making them easier to load from a magazine then the plstic capsule on the CCI.
However though, just like the CCI they won't cycle a autoloader and have to be cycled by hand
I use these in my 10/22 and try to always use theCCI's in my revolver or load them single shot in my bolt actions but both do the same basic thing.
In short they are good for shooting coons off your back porch or out of your trash can or shooting snakes that are about to bite you cause you nearly stepped on them and of course rats at fairly short ranges.
Overall not a bad shell if used for what they are made for.