STORMINORMIN;
correct, the 357 158 lead with 8.9g 800x at 36k cup is a listed data.
the 38 158 swc list "x" amount of 800x for 880fps at 16,000cup....
but they also list 9.7gr of 4227 at 825 fps at 15,700 cup.
In my 6" 686 with a 38 spl. case, a 158 lead needed not 9.7 grains of powder, but 11.0 grains to get 888 fps.
One reason I can not post my load, since it is over the IMR data, with the 800-X powder.
16,000 cup is a long way from 18,500 cup or 20,000 psi ......
but without the tools, or more data, you will have to settle with a "Standard load".