Here is a link to Hodgdon's website and the loadings for 38 Special in Cowboy loadings for a carbine:
http://www.hodgdon.com/data/cowboy/spc38spe.php

They list 158 grain with 3.2 grains of Titegroup at 815 ft/sec up to 3.8 grains at 920 ft/sec

They also list the XTP 158 grain at 4.3 grains for 905 ft/sec

Titegroup burns so fast that getting 1000 ft/sec and keeping pressure down will be tough with a 158 grain bullet.

To get over that 1000ft/sec threshold the pressure almost doubles in the .357 mag from 17,000 CUP to 40,000 CUP as well as the powder charge almost doubles.