Hans, brass can be formed from .30-30. You need to slug the bore, but jacketed bullet size should be around .320. Bullets for the .32 Win work fine, but I would not feed it 8mm. If that drilling has hammers, you need to get your loading data from the schutzen boys. That cartridge was hot rodded over the course of its life and some of the later data is a lot hotter than I would feed a hammer drilling. Look at any data that gives more than 1500 fps with extreme suspicion. Normal bullet weight is 170 or so.