I'm assuming that is from a long rifle barrel. You won't get those numbers from a 14". In a rifle, 357 magnum gets up around 2000-2100 fps. Buffalo bore's own 158 grain load is shown at 2150 fps. So at 2400 fps you have a good boost, and likely already hot. At 2600 fps you are certainly WAY over the SAMMI pressure limit. I'm not against going over the limit at all, but it isn't fair to compare a hot rod 357 maximum to a watered down 35 remington. The 35 remington has way more case capacity, and at equal pressure levels will always out run the maximum.
After looking it up, no 357 maximum will not out perform 35 herrett either, which appears to essentially be a hot loaded 35 Remington with a rim.