I've got a better idea. Why don't we all pitch in, buy a nice big yacht, and go sailing off the coast of Somalia. We can recruit enough artillery off of THR to take down every last one of those pirates, and it'd be all kinds of fun.
When it comes to gun ranges at sea, you have the whole ocean to shoot at, not just what's on your barge. As long as we're buying a barge, we should buy some bouys to use as target hangers. Just toss 'em over the side on lines of selected lengths, let them drift away, pop off a few thousand rounds, and then reel 'em in. Google "killer tomato" and you'll see what I mean.