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AA#7 was the 1st powder I was able to make USPSA Major power factor with in 38 Super, ~17 years ago. It was Israeli-made at the time, and very filthy.
The flash was very substantial, with a small comp I was using on a 1911 at the time.
The later versions of #7 were made in Czechoslovakia/Czech Republic (not sure if before or after their partition) by Lovex, or so I recall. It was somewhat cleaner than the old IMI stuff, but still flashy.
I agree with the above comments re. the economy - but when you have to make a certain velocity in order to be competitive, it's a small price.
To answer the original question - it's a slow powder, designed for competition use.
It's suitable for high-pressure loads in 9mm, 38S, 357 and 40, and for slightly reduced loads in 44 Mag.
LT
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