I used up a jar a long time ago.
It seemed to work about as well as any grease. It does seem to be more sticky then most greases and will pull strands off if you touch it. So, it seemed to stay put better.
Years ago I switched to Super Lube grease and oil years. One reason was that there was no info available on just what the Pro-Gold was-- a synthetic or ??, what the gold particles were and what purpose it served, and on what the properties about temperature ranges etc were.
I like to know what I'm using so I switched to Super Lube.
Super Lube is a synthetic Teflon bearing clear-white lube good from -45 to +450.
The oil is a thick oil-thin grease consistency that stays put and won't run off, evaporate, dry out, or migrate like thinner oils.
I buy the grease in cans and the oil in 4 ounce bottles direct from Synco.
I've opened up customer revolvers from as much as 10 years ago and the Super Lube was still present and working.
A good "feature" is that when it gets dirty it turns to a gray color.