Many people consider a lever action 30-30 to be a more political correct , and less expensive alternative to an AR or AK rifle. That is at least part of the reason for the shortage. People who can't get an AR, or don't want one, are choosing 30-30's and stocking up on ammo.
At 50-75 yards I'd rate 44 mag as a better hunting option than 30-30, especially on game bigger than deer. But in my experience it is also a little less accurate and bullet drop starts to be something you have to think about at even 100 yards But if you can get hits on game it is going to be effective past 100.