Ron, thanks for the Watts history. Man, that .46 WCF is a serious cartridge!
Since you are proposing making the .450 Alaskan better by giving it a Win Mag throat, couldn't we also improve it by lessening the case body taper to about 0.007" per inch like modern cases? This should yield about 2 more grains of powder--perhaps not worth it--while decreasing bolt thrust. I can't find a drawing of .450-348 Ackley Improved, so this may have already been done.
