If both frames are the same size, then wouldn't the forged Colt be stronger?
Howdy
Bear in mind that the pressure vessel in any revolver is the cylinder, not the frame. It is the cylinder that must contain the pressure generated when the cartridge fires. Both Ruger and Colt still machine their cylinders from solid stock, and then heat treat the steel for extra strength. Both are plenty strong enough for SAAMI spec ammunition.
What the frame has to do in a revolver is put up with the battering of the cartridge slamming backwards in recoil. Ruger heat treats the steel of their investment cast frames completely all the way through, resulting in a very strong piece of steel. I am pretty sure that Colt is still Case Hardening the steel of their frames. True Case Hardening is a very old technique where the outer surface of relatively ductile, relatively low carbon steel is infused with extra carbon to make a very thin skin (case) of hardened steel. Just few thousandths thick. The actual purpose of this technique was to retain the ductility of the core material, allowing it to absorb punishment, while providing a hard surface on the exterior for wear resistance. So in theory, the frame of a Ruger is probably stronger, but it is probably overkill, at least as far as SAMMI spec ammo is concerned.
As far as Colt vs Ruger is concerned, I am a traditionalist and will take the Colt lockwork over the modern Ruger transfer bar lockwork every time.
However, I hasten to add that a few years ago I had two internal failures with the bottom gun in this photo, a 2nd Gen Colt SAA made in 1968. A broken bolt/trigger spring one time, a broken bolt the other time. The bolt/trigger spring failure is quite common, the broken bolt is not.
That is why Bill Ruger started using coil springs instead of flat springs way back in the early 1950s when he brought out the first Single Six. And that is why this pair of 'original model' Ruger Vaqueros comes along as spares to every cowboy match I go to. I was very glad I had them along on those two occasions.