458 TAC-X styled 460-450 ?

I hope the line drawing takes here .
So here’s my thing . I have a 45 Raptor and a 45-70 and I aspire to a 45 American/WM so this makes sense to me .

Basically I took the 458 TAC-X shape for the 458 SOCOM at 300 gr solid copper . A straight copy gets it 384 and change plus nose cavity fill etc so WW should get a solid to 390 .
I stretched it from 1.23???? to 1.25 keeping the nose short enough for the 1895 at .45 from the top of the crimp groove (added) . As an after thought the bands should be rearranged or the middle band moved to out to .15 with grooves at .1 . My plastic school ruler doesn’t allow me to do the tapered grooves . I would want to keep the square bottom on the bottom band .
I don’t have a mould # reference for the Pope gas check shank but even on a 270 dia bullet it looks tapered and exaggerated in length leaving a lube groove above the check on the shank . I would like to follow that pattern here to use this as both a sub and supersonic bullet . My target weight is 450 gr but I’d be happy if that were exceeded and not upset if it will only go 425 . Because of my want for the sub and high BC keeping the nose small is a strong desire .
I have no clue about HP performance in this context but I don’t think a .15 wide by deep is going to do much in terms of lowspeed expansion so I’ll leave that on the table for the draftsman . Personally I’d cast it out of 50/50 maybe softer .

As a practical option I’m also interested in a .451-2 as a smokeless paper patched for 458 dia and we could swing it either way . HPs are fine also if it is able to be done .