Just finished testing an unknown powder in my 30-338 Magnum. The powder came in a large plastic jug from a fellow here who has no idea what it is. Has some numbers on it that made little sense. It is a ball powder that has obviously been contaminated with some stick powder. Rather than wait until Spring to fertilize the roses, decided to test and determine the burning rate.
Started with 50 gr, went directly to 60, then 62, 64, 66, 68 and finally 70 gr with a 180 gr Speer bullet. Velocities started out at a tad over 2200 fps, and ended up at 2940.
Determined the powder is a bit slower than 4831, and faster than 870.
Testing again tomorrow with 70, 71, 72, 73, and 74 gr. Will have it nailed down pretty close after that.
Ted