Last year, maybe even two years ago, I took two chamber casts of my .475 Tremor, measured a few angles for feeding, and modified some magazines to feed wide meplats.
Then I took my measurements, calculated the most (of everything) that I could get away with for a 400 gr bullet with a long nose in a short throat, and had Mountain Molds cut it.
I finally got around to casting some a while back, and got around to putting together some dummies last week.
Yea, um...
I got the nose diameter / ogive wrong, and they won't chamber without excessive force.
(I checked dimensions. The bullets drop within tolerances, as ordered.)
To rub salt in the wound, it fits and (otherwise) feeds as intended; and is too long for the .480 Ruger unless the ogive is 1/4" inside the case.
At least it wasn't a terribly expensive mold...
Perhaps I can find a caster shooting .475 Linebaugh in a TC, or a caster with another .470 / .475 cartridge that wants a 'plinking' bullet.
Time to pick out the MM 477-400s and melt them back down.
I'll have to dig out my chamber and bullet drawings again, to see how I screwed up and address that nose diameter/ogive.