About 6-8 years back I was looking for the same thing, but for my 5" 1911. I tested the following powders by taking my video camera out in the hills behind my house on a very dark night and setting it up on a tripod. I then video'd myself shooting 9 different powders with the excellent 230 gr Gold Dots.
At home I watched the results over and over ranking the following powders thusly.
Longshot = Large
Nitro 100 = small
700x = Medium
AA #5 = less than medium
Bullseye = Large
Herco = small
Green Dot = small
Solo 1000 = smallest
The Solo 1000 barely had a few sparks fly out the muzzle and even then only a few inches.
In addition, the Solo 100 gave excellent accuracy and velocity, upwards of 900 fps with the max charge of 5.5 gr. In fact it has given excellent accuracy in several 5" 1911's.
Just last week I ran out of my last 3/4 lb bottle and had to have a local gun shop order in a few more bottles as "no one" in the two valleys I frequent had any.
Hope this helps.
Alan
