[Hugh]

Numrich has Mauser Rifle front sight "blanks" that can be modified. The Mauser and Luger front sight slots are the same.

Older Luger bbls usually run .310-.311, the new reproduction bbls have .308 bores. 308 bullets will work in the old bbls as the bases will upset enough due to pressure to get a good seal. You can use 32 cal .312 bullets and swage them to .3095, I found that swaging in one stage very difficult, it was much easier to do it in two or three steps, .311, .310, 309 and final bullet dia ended up @ .3095. If you are casting, cast or resize them to .309 and they will work in both diameter bbls.
Here are some loads for the 30 Luger;