Here is some info from my work with Longshot. Always start 1.0gr lower and work up in .2gr increments until you see pressure signs. (Waters' method):
Starline Brass, CCI 350 primers, 1.26" OAL. 10 shot avg. G20 85F and 5000ft elevation.
135gr Nosler 13.2gr LS - 1542fps
165 GSHP 10.4gr LS - 1356fps
180 GSHP 9.6gr LS - 1294fps
200 XTP 8.2gr LS - 1172fps
These are loads that I have worked up to and are under 37,500psi when I had them tested. I hope this helps!