FIFY.Thanks. It is checked luggage. IIRC there was a 20 pound limit. but I was flying from Ketchikan to Seattle and it seems
The OP is talking about shipping ammo, not accompanying it it on a trip.
All domestic airlines AKAIK allow ammo in checked bags up to a certain weight limit. I've seen people posting here that AK airlines allows up to 50 lbs of ammo in your luggage. Perhaps this topic is the reason they do that?
Maybe Hawaiian Airlines should adopt a similar weight limit to address the same problem? It might draw more business.
rules change by airport not airlines. In any event guns and ammo checked in luggage on airplanes gets you a visit to special TSA inspections.