Maybe. For a reference point, I have, in my game, given out a winter-aspected bow that has a couple of powers to it - it shapeshifts to any similar weapon that the wielder might be more familiar with (in this case, a sniper rifle), and it can fire winter ice bullets (arrows, whatever) without needing ammunition. Since the game mechanics for guns don't call for explicit ammunition counts, this has so far proved to be entirely balanced as a zero point item - it's been occasionally more useful than a mundane sniper rifle (bullets that melt and confuse ballistics experts), and occasionally less useful (as a winter artifact, it can be tracked by winterfae, annoys summerfae, etc.) - but it's certainly not worth having spent refresh on a breath weapon power.