The garment bag is a neat idea. I was looking at getting a hard shell golf club travel case once I finally move my collection here. Something like this, that is long enough to fit older shotguns and rifles that don't come apart so easily: http://www.amazon.com/SKB-2SKB-4812...1161_1_8?s=golf&ie=UTF8&qid=1447532892&sr=1-8
But I don't think it will make a very practical case for taking to the range. Interested in seeing what other people have come up with.