As you've found, the brass framed guns can give fairly long service if the loads are kept on the light side.
Mention was made in the "link" about the strengths of brass and steel being similar so approching this from an engineering position, I'll give the following thoughts:
STRENGTH OF MATERIAL:
Cast Brass (C94800)* Tensile strength=50,000 PSI, Yield strength=23,000 PSI
Cast Carbon Steel (ASTM A27-81 Grade 65-35)* Tensile strength=68,000 PSI, Yield strength=38,000 PSI.
The steel has 36% higher Tensile strength and 65% higher Yield strength.
Tensile strength measures how much load it takes to break the part while Yield measures how much load it takes to permanently deform it.
With the basic Colt design, the Yield strength is the area of greatest concern to me.
With this design, the steel Cylinder pin is the only thing that is actually holding the barrel onto the gun. This steel pin is attached to the frame and if the frame material (or the pin) yields in this area, the cylinder pin will move forward.
Because the brass is 65% weaker (yield) heavy loads can cause it to move. As it moves, the cylinder pin will also move making the gun "loose".
Brass will "work harden" if it is bent or moved due to yielding. This hardening makes it more brittle which increases the likelyhood of it's breaking. Under a worst case scenario it could fail allowing the barrel, cylinder pin and cylinder to be blown off of the gun.
This probably wouldn't hurt the shooter but it would end his fun at the range.
Just something to think about. :hmm:
All of this does not mean I do not own any brass framed guns. I do own three .36 caliber revolvers representing three different Confederate manufactures.
I enjoy shooting these guns bur I am mindful of the weaknesses of the materials and use 14-16 grain of powder.
*The materials selected are average in both groups. As I have no way of knowing the actual materials used in these guns the selections may not represent the actual product.