Hi JohnnyReb,
I've owned a .30-30, .45-70, and .444. Probably more medium sized game (deer, black bear) has been taken with the .30-30 than all the rest combined. I was never impressed with the .444 and didn't keep it very long. However, one of my favorite cartridges out of 200+ guns that I've owned has been the .45-70.
Now I've never owned one in an Encore; but I had the Ruger #1 and a Marlin lever action. All the deer I've shot with a .45-70 have been one shot, dead on the spot. I used handload with the Hornady 300 grn. jacketed hollowpoint and never had the slightest problem. There's plenty of factory ammo in different variations and I would think you could find ammo at any store. Loaded right, I would think you could take just about anything on this continent. Well, I may want a little more for polar bear, brown bear, etc.
So, for what my two cents are worth, I doubt you'd ever regret buying the .45-70. Now that I've got you convinced, you might want to think about the 7mm-08...............right Redhawk???
Karl