sadly 1400fps is about max for a 357.... u might be able to sqeek 1550fps.
the 41 mag was issued to very few police departments with a 210 grain semiwad cutter, delivered at roughly 900fps. alternate loads include a 170 grain hollow point delivered at a whopping 1790fps. besides concerns of overpenitration, the frames were bigger on the 41, and not everyone liked the bigger size. this gun was marketed as a police weapon and as it turns out was a dismal failure. hunters loved it though. its balistacally superior to the 44 mag in 2 and only 2 bullet weights, 200 and 210 grain.(better KE and velocity) but anything heavier and the KE of the 44 starts overpowering the 41. with the correct adds and a ravinous pack of fanboys, the 41 probably be much more popular than it is now!!
my point? you have to sell your products to people who are going to buy them not anyone else or your product will likely fail.