I did a chamber and bore cast today and it looks like it is in fact 8x57JS (.323) rather than 7.92x57I (the .318 cartridge). Grooves are .3235" lands are .314". Chamber is tight - wont's close on my neck-sized only reloads but will on an S&B 196 SPCE. Short, narrow leade at .3265". So, should be a shooter. But will have to get a FL sizing die. The S&B ammo is CIP loaded (MAP of 56kpsi), so will use a more mild approach.