i8asquirrel, you might want to take a look at TinStar powder. Its hard to find and expensive but I've found it gives much more consistent velocities than TrailBoss with light subsonic loads out of my 7.62 tok. I've not tried it yet in my 300wtf. Its a bulky powder like TrailBoss.

Thanks for the heads up I will look for the powder. The 4759 shows some promise It functions my semi aouto just fine with a 150gr bullet but I am really hoping for a better load for the 90gr expander!