Ruger can't beef up their 1911s the way they beefed up their single action revolvers. The Blackhawks and the original Vaqueros are physically larger than a Colt 1873 SAA, with (particularly) a bigger, beefier cylinder to handle hotter loads. The chamber of a 1911 is integral with the barrel and the outer dimension can't be enlarged without enlarging the slide, and then all the dimensions of the gun are off.
So what if the dimensions are "off"???
Ruger isn't making the pistol to meet a GI contract. No one is these days, and only those claiming their guns are "GI spec" are even trying to be close.
Anyone who makes a 1911 type gun, or parts, and says "some fitting required" is making them with dimensions that are "off". I don't know about the Ruger 1911, but I did have my son's S&W 1911 for some time while he was overseas. Very nice gun. GI/commercial 1911 grips would NOT fit the gun. Grip screw spacing was "off". Intentionally, no doubt.
I don't know if Ruger DID "beef up" their 1911, compared to the original Colt/GI specs, but there is no reason why they couldn't.
Will hot 10mm kill a 1911?
Not if the 1911 is properly designed and built for the 10mm. Guns
adapted to the 10mm could be a different story.
I've got a Coonan .357 and an LAR GRIZZLY in .45 Win Mag. used to have one in .44 Rem Mag. These ARE 1911 pattern guns, though not, obviously GI MilSpec 1911A1s. The base design can and does handle the pressures, WHEN it is properly built to do so.
And just an FYI about Ruger's Blackhawks being bigger than Colt SAAs. It wasn't done to make them stronger. It was done to be certain they would be AS strong. Ruger was pioneering a casting process that was making cast parts for frames and receivers, which had always before been forged parts. Even the best cast is not quite as strong as forged parts
of the same size. So, to be absolutely certain their frame were going to be as strong as the forged frames (Colt, etc) they knew their casting would need to be a little bit bigger. According to legend, Ruger decided to make them a little bigger than the needed minimum.
Bigger frame = bigger cylinder (which is a forged part) and so they turned out to be stronger than the Colt SAA. Ruger's NEW VAQUERO is exactly the size of the Colt SAA, (and just as strong) but that design didn't come along until after more than a half century of experience making Blackhawks.