Yeah... to further make you guys excited: Look at specs on the .460 Rowland... crazy right?
Now, get this, the Starline brass for the 460 Rowland is made in the same manner (same heat treatment process) as the 45 Super - thus, 45 Super could be loaded to 460 Rowland specs if the pistol could handle it (*The 460 Rowland conversion is a serious one with new barrel and compensator and mag springs, etc. A little more involved than just swapping recoil springs.)
I'm using Hodgdon Longshot for my 200gr. 45 Super loadings and the book data max is 8.1gr - The same data minimum for 200gr .460 Rowland is 12gr (but the brass is the same in construction & material).
So, I decided to see how far I could go with 45 Super...
I went in .2gr increments from 8.2gr upwards. You'll be please to know that with my gun (Ruger KP345) and my components I did not see a single sign of overpressure all the way up to 10.6gr of Longshot (almost getting to 460 Rowland minimal specs) - we're talking easy 41 Magnum performance (easy beating 10mm Auto --- and it's a .45ACP at the heart

).
I had to stop there though because at 10.6gr the recoil was so incredible that it was causing the cartridges in the magazine to flip and stove pipe after each shot! (literally each shot cause a stove pipe of the next cartridge) - This could probably have been fixed with a stronger mag spring, but why push it
At 10.4gr of Longshot I was getting the above problem once every 4 or 5 shots (not reliable).
At 10.2gr I've had zero malfunctions in over 100 rounds. It's awesome. I was at the range yesterday and I let a Range officer fire these little monsters and his exact words were "Holy Sh!t!!!" after the first shot.
He said he felt like he was shooting a revolver - it's really not that bad though
I love the 45 Super. Of course as with anything... find out what works for your gun. The Ruger KP345 has a very tight chamber and is a strong gun.
I think the Glock could handle it with a stronger recoil spring, but you want to do as I did and check for signs of overpressure as you go up. Look for primer smear and case bulge.
P.S. As a testament to HOW STRONG the 45 Super brass is and how tight the RUGER chamber is... I can take the spent brass from a 10.6gr loading and it will still drop in the chamber (a little snug, but still all the way no problem)

Whoa!