In the October, 2007 issue of American Rifleman magazine;
Bryce M. Towsley tested BP and the various BP substitutes. Yep, his tables have errors but most of the data is correct. Towsley did not give any data for the two stick load of JSG sticks because it was so erratic. He had to crush the sticks to prevent a squib load.

Using three stick JSG load, the standard deviation for velocity was 207 fps: This is awful. As a comparison: The SD for velocity using a 150 grain charge of Pyrodex RS was 22 fps. The SD for velocity using 150 grains of 2F Pinnacle was 24 fps.

JSG made an excellent powder for Goex. It was called Pinnacle. Pinnacle is more powerful than JSG. That powder is no longer available. i've got cases of the stuff stored in 20mm Army ammo cans along with dessicant.