Newbie reloading questions

[Don McDowell]

Ed shooting blackpowder it likely won't be necessary to resize those cases. The chambers on those rifles are pretty tight.
However shooting smokeless and some of the subs the cases might expand a wee bit much, and resizing will be in order.
Trapdoor section of your loading manuals is plenty for anything a 45-70 needs to do. Of the powders you list varget and 4895 likely the best place to start.
You don't really need magnum primers, but if that's what you have then go right after them.[/i]