Do the math before selecting a chambering!!

I am 99% positive a .243 or a .308 will hands down beat the cost of a 45-70 or any other straight wall case.

You may get a few less reloads per case with a .243 or a .308, but, the per case price of the bottle neck brass will be so much less you will be far ahead.

Also, you will use less powder (a factor these days), and, the bullets will be far less in cost for bottle necks.

If straight case chambering were cost effective, everybody would be shooting them.

In the lower 48, the .308 is tough to beat all around, and east of the Mississippi, the .243 is right up there!!

We haven't even mentioned the poor bullet trajectory of the 45-70!!

For lowest total cost over the life of the rifle, as well as enhanced user satisfaction, get a .308.