It is safe to say you can't identify a powder by looks! Hercules Lightning #1 was a perforated disc and so was Hercules Sharpshooter #1 . Early Herco may have been a perforated disc, but it isn't now. Lately, Trail Boss typifies the perforated disc, but we know what you have probably isn't TB. 700X and 800X aren't perforated discs, so it isn't either one of those.
Still, you can determine what it is like in burning rate. If you load it like it is the fastest burning powder, there is no way it can be an overload, but it may not perform very well either. If you get velocities similar to Bullseye loads, you can use Bullseye data, even though you don't know what it really is. If you don't get close to 880 fps with a 158 gr LSWC in .38 Special using 3.5 gr, move up to Red Dot loads and try again. If a 4.2 gr Red Dot load with that same 158 gr bullet doesn't produce close to 930 fps, try a slower powder's loads. If the Red Dot load is over 930 fps, you have to drop back to a faster powder.
You'll probably have to check each caliber being loaded with this method, since powders act differently at different load densities.
It isn't very scientific, but at least you can make use of the powder, especially if it's hard to get powder where you are.
You might want to check these loads for comparison's sake.
http://www.bbhfarm.com/gallery/album10/aal?full=1
