Other then lack of demand (which is a tremendously valid reason) why doesn't swift make a .450ne a-frame versus their .458 RM or Lott variety?
I expect the 500’s will regulate just fine. Most likely the 450’s will do well also. I had no issues but maybe I was lucky. Good luck and enjoy the discovery!The O-jive on the 480gr 458’s designed for the 450NE is unfortunately different than the O-jive on the 450gr and 500gr .458’s designed for other 45cal firearms. Additional the cannelure is also in a different spot.
I recently purchased some A-Frames in each grain weight to see if I can get them to regulate. Not holding my breath but going to give it a try, just haven’t had a chance.