Titewad should work well, but you are going to be struggling with consistent ignition at those speeds, especially if it gets a little cold. I've shot tens of thousands of 7/8ths load with titewad, and even those can get a little wonky when cold (below 10 degrees).
I would suggest using newish hulls, putting a good, deep crimp on them, and using the hottest primer you can get your hands on (ie. Federal 209a or cci magnum). HTH, Dutch.
