My German reloading manual, which is issued by DEVA, the agency in charge of proof testing in Germany, lists the maximum pressure for the 6.5X54 M/S as 3650 bar, which converts to roughly 52,940 psi. All the loads they list are maximum. For instance, they list 36 grains of Vihtavouri N140 with the 140 grain Nosler Partition as giving 738 meters per second, or roughly 2400 fps.