Since nobody has mentioned this, I figure it's worth sayin'.
Y'know that there were 2 very different rounds sold as 25-20, right?
25-20 Winchester is the only one that is readily available. OK. Not so readily available, but at least, still produced.
25-20 Single Shot, has a smaller diameter, longer case than the 25-20 Win. Cant use one in the other, so...
25-20SS shows up in Win 1885's, some Stevens single shots, and a few more. 25-20 Win was used in a lot of the same rifles, plus guns like the lever action Winchesters.
Just sayin'. May or may not save you some cash outlay.
For the price of four or five boxes of ammo, you can buy tools and materials to be set up to reload.
Cheers
Trev