So, one can dream all daylong about the wonder of it all, it isn't real.
It's real. What is isn't is in current production. And a large part of that is people seeing one and responding "too big! too heavy! too expensive! Not practical! etc.
Yes, the .45 Win Mag is
a lot shorter than the .44 Mag
Less than 0.1". Case length .45 Win Mag, 1.198", .44 mag, 1.285"
Less than the difference in length between a .44 Mag and a .44 Special or the difference between a .357 and a .38 Special.
I've never seen a 45 WM cartridge let alone fired one, but it seems to me folks shoot 44 Mag in revolvers that are not all that much heavier, if heavier at all, without complaint.
Maybe you just aren't
hearing the complaints? Have you shot full house .44 Mag though a S&W Model 29 with the factory wood grips? It is NOT comfortable. And done less than perfectly it hurts! That's one of the reasons aftermarket grips, and bigger, heavier pistols are popular. They lessen the felt recoil. If you want a real eye-opener, I'll let you shoot my .44Mag Contender! 10", unported, one of those old beautiful thin pencil shaped barrels. Not responsible if the gun hits you in the head!!
Here's one that fires a round longer than the .44 Mag
but not a lot, 1.298" case length vs 1.285"
And its a "bona fide" auto pistol cartridge (rimless). The .44 Auto Mag Pistol.
here's a size comparison with a Model 29-2
And with a .44 Mag Desert Eagle
I will agree the DE has more mass than it absolutely needs. On the other hand, they seldom break...
My issue with the DE is the specific way they executed the design, more than the weight. Look at the grips in the picture. The .44AMP is a slightly longer case, and yet the grip of the Desert Eagle is larger. Its not the length of the round that matters most, its the package you put it in!
And here's a .45 Win Mag Wildey for comparison. Again, not the length of the round, but the package its in..