Originally Posted by
15meter
Absolute shot in the dark here, but you say you've had success with .43 Spanish brass you may be able to use 7mm Rem Mag brass. I've used it to make .43 Spanish brass. I use a snap ring in the extractor groove to make a rim.
There are several threads talking about converting 7 Mag to .43 Spanish. It can be done. I think the belt on the magnum cases is supposed to be .525.
Like I said, shot in the dark, never have done it and too lazy to look up the specs on the russian and compare.
I think almost any of the belted cases could be used as donor cases, I used the 7 Mag because they were there.