What do we really know about the transonic zone?

[Distant Thunder]

I think if one were to put some thought into converting the 410663 into a .45 caliber pp bullet that would match the chamber dimensions and twist rate of one's rifle the rewards would be worth the effort. I'm sure Brooks could cut a mold and probably already has. In a 16-twist .40 that bullet really shines.

It did not work at all in my 18-twist .40-65. The first thing to establish is the length for your twist rate. Then the nose length and ogive radius and the tip radius. The diameters would depend on the chamber, brass, freebore and bore of a particular rifle of course. If I can find a little time in the next couple weeks I'll draw up a .45 caliber paper patch version of that bullet and see what it looks like. For an 18-twist of course. That would be interesting.