Quick, I have some of the .459 720 gr bullets and .500 700 gr bullets, just got them from KDM. I plan on using the .459 720 gr bullet in my 450 Marlin Mauser bolt action rifle, i can load them to crimp in the crimp groove and still have room for powder, will post the loads and velocities when i get to testing them, unfortunately, it will be after hunting season this year, but I will test them and post it, of course I will be loading the .500 700 gr bullets in my .500 SW Mag Handi rifle, will post the results for that one also, its not crazy to me to use such heavy bullets, that is the fun of testing and shooting....Jim