I'll assume this is for bear defense.
To heavy to comfortable carry around in the woods
God forbid you see a bear and shoot you have to hope to hit and kill in one shot because you aren't getting rapid follow ups with that.
You got a round that has tons of powder and gave it the shortest possible barrel length to burn in, makes sense.
Nope, they make a 2-3/4" 500 as well...http://www.cheaperthandirt.com/product/39971