RWM- as the rim is only .010" smaller than the head, that's only .005" per side, the feeding is flawless in the m70 non-controlled feed I'm using if only 3 rounds are in the magazine. 4 rounds created too heavy a spring tension and cocked a round down in the nose. I tried it in 2 of my m98's that had been altered to short magnums, and they-too fed without a hitch.
: This round, the .450 Alaskan with it's new (I guess)rebated rim might be a new round, but may not be. The reamer I bought was listed as .458 Alaskan, which is as good a designation as any for the rebated rim design on the old "Alaskan" round.
: I've not named my 9.5X68, although reamers and dies are now available as such(mid 90's). I also haven't done much with the .30/03, which I developed back in the mid 80's. I like playing with strange stuff - with easily obtained brass and otherwise normal or wildcat reamers.