Why is this even in the game, and as an exclusive infection mission reward no less? It's totally useless. You'll pretty much never find yourself in a situation where you'll be wanting to shoot through 3 or more enemies from a single shot not fired from a rifle or magnum.
They should've let it pierce through Scarmiglione shields and Draghignazzo hides.
I agree. At first I thought it would shoot through shielded enemies but it doesn't work so meh. It's just like the Punisher in RE4. And to make things worse magnums and rifles have this build-in so....
Although it does have its uses. Ever wanted to kill a whole screen of hunters in 1 second? Use a Drake with Full Burst and Pierce2 :)