Hi Corbin,

Well that is a new caliber to me, cannot find any CIP data on this one as it seems not to be listed among rimmed CIP calibers. Closest I can find is the 6,5x52R, it has PTmax at 2450. Is there any more detailed information to be found on .256 Mannlicher on the net, all I can find it is class1 as we call it here and that might be it has way too high PTmax.

Thanks for the tip