I have a pre 64 32 win that I shoot cast bullets in with h4198 you can neck up 30-30 brass but I see 32 brass all the time, if you don't cast the Laser cast bullets shoot well. I shot my first deer with that rifle and it still works pretty good today.
If you want to load black powder its just like loading black in a straight wall case you just need the right bullet lube some type of wad I use .030 vegetable fiber but you could punch them out of tablet backing and most important slug the bore and use the proper sized bullet