Although I am truly a "newbie" I thought I would pass on my experience for what it's worth.

I had developed a good load of 85g T7 and 245g shockwaves for my new TC stainless Omega. I finally got a chance to get to the range with some Black Mag 3. My impressions:

1. The Black mag 3 is much cleaner, and less crud ring than the T7

2. With the same 85g charge, the groups were good... comparable to the T7

3. The Black mag 3 has a noticably harder recoil than the same charge of T7

4. The Black mag 3 patterned about 2 1/2" higher than the same charge of T7 with the same bullet.

Again... for what it's worth!!