"S&W eventually found the capability to lengthen their cylinder and topstrap."
Yep, after it became clear that the US Government was never going to adopt the No. 3 in preference over the Single Action Army, and after S&W had finally fulfilled its contracts for No. 3s with Russia, Japan, Turkey, and other nations, which freed up a lot of production space.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.