Bob, I don't have the 45/70 but I just bought the .444 last year. I bought two boxes of factory loads and decided I had spent enough. My reloads for it are much more affordable. I spend about $.17 per round now as opposed to $1.10 for factory. I'm sure your savings would be similar.
As to the hand press, I have one of the LEE hand presses that you can get for about 25 bucks and although I have not used it on the .444 or 45/70 I have used it for .223 and .308 without a problem. It does require a good bit of leverage to size the long cartridge but I don't think it should be a problem as long as you lube the case good first.