Drachenbut, if you can afford M-H cases and a reloading die set, maybe a bullet mould, then you can probably afford a diamond lap file and an adequate eyeglass for about 30 euros.
(NOTE to moderators: It would be useful, and surely not a grave breach of personal security, to know at least in which country contributors are located!)
Apologies: I take it all back! Maybe you can't afford it BECAUSE you got the M-H cases and a reloading die set

When I got my Egyptian Rolling block, the rifle came "free" with the RCBS die set. And I have a M-H. And a Mauser 1871. All rather expensive for brass! But those old smoke poles are eye-catchers at the range, so crack your piggy-ban and persevere!
Getting serious again: good tooling is worth it in saved time, effort and ammo!
Patrick