Hey all, I just ran across this on Lee's site:
https://leeprecision.com/vry-ltd-4-die-450-bushmaster.html
Finally a more reasonably priced die set alternative to Hornady. Unfortunately, I can't find anybody that has it in stock yet. It does say new for 2018, so I'm guessing it's just not available yet. If anybody find this in stock somewhere, post it up!