If you actually own and shoot a .45Win Mag pistol regularly, with real .45WinMag ammo (factory or handloads), you already understand just how absurd the concept of the 10mm ammo is.
Fuzzy reasoning ... Why switch the subject to a non-45acp .45 cartridge?
The .45WM was available in Col. Cooper's time. Did he suggest chambering it in a 1911? No, but after the business end of the Bren Ten failed (Dornaus & Dixon), he sure pushed chambering the 10mm AUTO in a 1911, later to be known as the Colt Delta Elite. It's no mere coincidence that the COALs of the .45acp and 10mm are nearly identical. He also considered the attempts of various ammo-makers to push the standard .45acp faster, but noted you generally had to use less weighty bullets to do it, which he rejected. The 10mm is more efficient, being capable of sending "relatively heavy (200gn) slugs," as he put it, quite fast.
Ok, the 10mm is more powerful than the .45ACP. and more than ACP+P, fine. But there are bigger more powerful rounds than the 10mm, as well. If you want to spin that wheel, you won't come out on top.
Not talking about the mega-magnum cartridges that have to be carried in such pants-drooping behemoths as the Desert Eagles, Wildeys or old AutoMags.
Only those "service size rounds" which fit comfortably in "a modern semi-automatic pistol of reasonable size and weight," which Cooper specified as not much beyond the specs of the 5" Government 1911. He conceded that the Bren Ten, and later, the S&W 1006 were both right up on that border.
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