Henry and '66 in .44WCF/.45C

[Shorty]

The Henry and the Model 1866 Winchester (Improved Henry). were chambered for the .44 Henry Rim Fire.  Winchester came out with the 1873 to handle the new, more powerful .44-40 (.44WCF).  Today, one can get either model in .44WCF or .45Colt.  So, if those were not strong enough originally, what do the manufacturers do different now?  Is it a beefier frame?  Stronger materials?   :?

[Cuts Crooked]

Mostly improved meturlagy I imagine. Gunmakers bronze is much stronger today than it was back in the 1800s

A few Henry rifles were made  with iron frames, but the expense of making them was prohibitive. Improvements in manufacturing techniques had more to do with the introduction of of the 73 in a steel frame than anything else, I suspect.