7mm super mag

[Varmiter71]

I was wondering if there was any cartridges that you can make 7mm super mag out of other than 357 max brass.
I heard that you can make it from 5.6x52R brass.
But I also heard that you can make 5.6x52R brass from 30-30. Is any of this true.
I have acquired a few BF Arms pistols in 7mm super mag
I also got an AR in 25-35 Sharps and my gunsmith thinks it would be cool to do a rimmed version on a BF Arms action

 

[rickiesrevenge]

Why wouldn't you use 357max brass? Starline had it in stock last time I was on their site. RWS made 5.6x50r brass that could probably be used. The 5.6x52r will be too fat at the base for any 357max based cartridge.