First, let me say that I loves me some 45 Colt.
A need has arisen to dispel some untruths...
1) A Super Blackhawk is nothing more than a Blackhawk with a different grip frame. See the Vaquero above? Being an early 90s large frame design it is the same frame (except for the sight groove) used on the Super Blackhawk. I can remove a few screws and slap a Super Blackhawk grip frame on that gun. Call it a Super Vaquero.
There is no difference in the cylinder materials or dimensions. Barrels screw on and don't really contribute to the strength of the design.
2) Redhawks and Super Redhawks do not have the same cylinder materials when you get to the 454 and 480. Ruger switched to the Carpenter 465 steel on those. 44 magnum variants are made of the standard materials.
The Redhawk has the regular Ruger blend of stainless steel in all calibers.
3) The Super Redhawk uses a different blend of Carpenter stainless for the 454 (maybe 480) barrels. It was developed to limit forcing cone erosion from the insane pressures of the 454. The material offered good machining properties while being tough enough to stand up to the cartridge. 44 Magnum barrels use standard steel.
4) The Super Redhawk cylinder measures 1.748" long.
The Redhawk cylinder measures 1.748" long.
The Vaquero cylinder measures 1.699" long.
That's less than one half of one tenth of an inch long. It's thinner than the rim on a 45 Colt case. Thinner than the crimp groove on a bullet. I don't know what you're planning on doing with that tiny amount of space.
5) The Super Redhawk cylinder is 1.792" in diameter.
The Redhawk cylinder is 1.780" in diameter.
The Vaquero cylinder is 1.727" in diameter.
If you want to tell me there will be an appreciable difference in strength in .012" of diameter I'm going to chuckle at your expense. That makes a .006" per side difference. When a gun goes high order it's not due to 300 psi or even 1000 psi. It's going to be a whole magnitude higher. The tiny difference here is negligible. Only the material makes the difference.
Stepping down to the Vaquero/Blackhawk cylinder makes a bit of a difference. Still, if you're relying on .035" of an inch of steel to save your bacon remind me to not go shooting with you.
6) All cylinders have the notches in the same place. That place would be just off center of the bore. The single action guns rotate backwards so the scallop is on the opposite side of the notch. Since it is not as deep as the notch it offers no appreciable impact on strength.
7) The SRH and RH cylinders lock up the same way. 3 points of contact each. Whether that is stronger than the straight through base pin of the Blackhawk is up for some debate. It would take considerable research to reach a scientifically acceptable answer.
8) The Blackhawk/Vaquero grip angle allows the gun to slide in the hand under severe recoil. It will try to rip your wrist off but the rotation imparts less torque on the body.
The RH acts much like the single actions in that the gun rotates under fierce recoil. It doesn't move as much so there is a bit more sting. The bulk of the gun (when compared to my shorter Vaquero) dampens the impact.
The SRH does not rotate like the others. The rubber grip holds onto your hand and results in more torque being applied to the wrist. The Sorbothane insert cushions the blow but is too narrow for my wide palm. I get hit with a 1/2" wide hammer the height of the grip when launching heavy loads.
9) The 7-1/2" Super Blackhawk Hunter weighs 52 ounces.
The 7-1/2" Redhawk weighs 53 ounces.
The 7-1/2" Super Redhawk weighs 53 ounces.
Weight distribution on the first two leaves them a bit nose heavy and a touch more resistant to flipping recoil while the SRH is more balanced in the hand and more lively under recoil.
Want to have some fun and toss the Contender in the mix?
With the scope it is a bench gun. It requires support for well aimed shots.
It is lighter than the RH/SRH without the scope. The lack of a cylinder gap means EVERYTHING the cartridge is packing goes down the bore. Recoil is fierce when loaded hot. Accuracy is outstanding with the Match Grade Machine barrel.
As for absolute strength, I can honestly say that all of these guns are more of a man than I am.
For long distance shots my accuracy runs in this order:
1) Contender by a substantial margin.
2) Super Redhawk
3) Vaquero
4) Redhawk
More trigger time with the Redhawk would probably slip it above the Vaquero and into a fight with the SRH.
All this is probably more than you guys wanted but that's my take on the Rugers with a ringer thrown in.