If you're in a state that allows 30-30 or .243 Win, it's understandable that .350 Legend doesn't move. It's a straight walled cartridge that is only allowed for the harvesting of deer in many states, such as Iowa, Nohio, and several others. Just like .450 Bushmaster, I'd only use it when I was restricted by law. .45-70 Government is another of those legal rounds. I really like my Browning 1885 High Wall in .45-70 and it's brought meat to my freezer. However, if given my druthers, I'd choose .243 Win for whitetail. Only here, I'd be facing some serious time, fine, and confiscation.

If I had to hazard a guess, .350 Legend just ain't a high demand cartridge where you can use .30-06, .243 Win, etc.