The 7x54 and 8x54 are known wildcats; at least the latter has also been factory loaded by Norma. I own a 8x54 myself. Its performance is akin to the US factory loads of a "8mm Mauser".
A 6x55 is mentioned in the Vapenjournalens Ladebok, too, and associated with the name of Tor Treider.
Regards, Carcano
Posts: 2452 | Location: Old Europe | Registered: 23 June 2001
If you aren�t fuzzy about whats a wildcat or not, I guess the 6,5x55 Ackley Improved is a good cartridge with a fine record based on the swedish mauser.