That IS some right-fine shooting, sir.
I have a relatively-recent Lyman #452423 that has remained unwarmed since I got it in June 2018. I plan to change that as soon as the Summer Blast Furnace (which returned on Monday) burns itself out. The "423" is the Keith bullet meant for 45 ACP revolvers, and its cavity has kind of a squatty aspect to it. So do my #454424 moulds (one each 1-cav and 2-cav), though they scale @ 253 grains dry & unsized. David's RCBS 45-270-SWC photo looks like what a 45 Colt SWC should look like to me. #424 looks abbreviated, for lack of better descriptors.