You may also want to try 3F as well. I have been shooting 4 1/2 drams of 3F Goex in a heavy Parker 10 gauge hammer gun for many years, and it performs wonderfully. I use 1 1/2 oz of bismuth, brass cases, and fiber/wool wads. Again, it was Sherman Bell that turned me on to using 3F in all shotgun loads. Through his testing he determined 3F was the closest granulation to matching the quality of "sporting powder" that was originally used in the late 19th century.

Never have been able to have them tested, and was always curious.