How many of you 'armchair tacticians and ballisticians' have any first hand experience with any of the rifles in the poll or were ever soldiers?
The only one I don't own or have experience with is the Spencer. Anyone who thinks the Henry has "major problems", is weak or deficient in any way has never fired one. I have an "Improved Henry" as well, the '66, the first rifle to bear the Winchester name, and prefer the Henry for it's weight and accuracy.
Most infantry and cavalry fighting are 'up close and personal' affairs. Firepower outweighs all other factors. If heavy hitting calibres were all that important, our troops would still be armed with the FAL FN C-1 7.62mm and not the 5.56mm 'poodle shooter'.
We aren't dropping horses any more, but we do have to contend with body armour.
Then and now, a wounded soldier is more of a liability than a dead one. He requires many people to tend his wounds, transport him, feed him, etc. That strains resources. A dead man is simply buried.
Again, I refer you to Peter Schiffer's book on shooting all the guns mentioned here and more. He also researched the contemporary official impressions of these arms and their battle records.