I will be loading these in magnum brass for a SP101. The powders I have on hand that I am going to start with are Hodgdon HP-38, HS-6, and Titegroup. Digging through the data, these seem to be the best ones to give the velocity of 900 to 1000fps I am looking for. I do have other powders that I can go to if desired results are not achieved. Look for results in my reloading journal in the coming days.