Re: "I've really enjoyed using my .45-70 single shot..."
Here's my Great Uncle "Freddy" with his Model 1873 Springfield:
In one of my Pappy's old gun books (circa 1948), the writer opines that "The .45-70 was a fine cartridge in it's day... and it's day is far from over.".
One of my favorites.
BTW; One of my favorite personal "Good luck charms":
Systema 27; "Sen'ior Quattra Sanque"; M-1911A1 with a Spanish accent. (Argentine).