Many reports of it performing horribly in any number of rifles. Most old timers say that cast boat tails aren't common for a reason. Some guys can barely get them to work even in 300BLK which it was arguably designed for.
Powder coating could give it enough protection to work well, I'm not sure as I only powder coat for my 44 mag.
There are so many other sources for 200+ grain .30 cal bullets with plain base or gas check designs that I don't see a point in trying when so many people report having issues with it. Accurate Molds has a .31" 260gr design in their catalogue if I want to go super heavy. Casts .310", size down to .309", and load.