Since you can safely load a 155gr to 1300+ with the 4" 2.0 40sw, I don't see the need for a 357sig barrel.
I run HiTek coated 155gr lswc to 1350fps using Hodgdon's published Longshot data. The 2.0 barrel gives perfect casehead support, and the I run 1.16" COL to build a little extra margin.
But what I really need is a source for extra power recoil springs.
Reloading Tips for 40sw - Christian Ed and Hobby info