I think you are looking at "original range" in the light pink, which included Ill. and I am looking at the dark pink of "1870 Range". That is the hundreds of miles comment. And the bullets weren't made until 1873, I think.
110 lbs. doesn't mean your wife isn't tough, also. But lets try this: Sit her down on a frozen pond, have her bust a cap and let's see if "opposite and equal reaction" really works! Do you use black or smokeless? I have read that the differences between the physics of the powder explosions may make a difference.
It is interesting where one finds bullets. I have worked a number of yards in a "small town" that is suburban to Denver, and have found expended .45s, .22s, and even a 30.06 in front yards. Makes ya wonder.....
Any one know when the .45-70 started to be a rimfire? I found one of those once, out in Ft. Big Springs.
Interesting story--when the Indians were restless, they sent a troop or two of soldiers out from Ft. Kearney, I think, to man this camp and "show the flag". Although there were no buildings left, this place would have been a dead ringer for the post in "Dances With Wolves". Ft. Big Springs protected the Butterfield Stage line road, several cattle trails and a couple of emigrant trails, so it was somewhat important.
But, unfortunately, I suspect the center fire casing was from a deer or antelope hunter. Are we back to deer hunting again??