Depends on the case head size, the 270Win is a factory offering, .470" case head at a SAAMI MAP of 65kpsi looks good to me, but 60kpsi with a 30-06 size case head is a usable figure. Bigger case head, lower pressure, the 500S&W is another factory offering, ~.526" case head depending on what drawing you use, a SAAMI MAP of 60kpsi, but the highest data I've seen is 53kpsi.
Tim