Yes, there has...
I spent ALL DAY today coating bullets but NOT the closed container shake and bake (SnB) as I'm 100% comfortable with that process with my powders and results. What I did was follow all of the advice I read online for WET coating them and decided to experiment a bit and wound up with a pretty good solution to making bullets faster than I could with either the WET or shake and bake methods.
Before coating I size my bullets because my .38 cal molds cast to just over.360 and they are hard to push through a .357 Star Die. You can imagine the workout I get sizing them so today I sprayed them first with Frankford Arsenal bullet lube, let them dry and then sized them.
Using a Folgers #2 coffee container, I dumped the bullets in and agitated them without the top on for 20 seconds or so, in my yard, in full sun and the paint stuck like glue. Here's the kicker, any powder that does not stick to the bullets stays on the bottom of the container and will stick to the next batch!!! But would the paint stick after baking them?
So, I unceremoniously dumped them into an open aluminum baking pan, shook the pan for a few seconds, baked them ~@425 degrees for 20 minutes, and let them air cool... without a water quench because I quenched the bullets when I cast them last fall.
I smashed a few totally flat into bullet coins and the PC stayed on perfectly and the coverage is excellent, better than the shake and bake method. As a matter of fact, the grey paint I used had failed me terribly with the SnB method, but I decided to see how good this adhesion method really is. So, on a lark I dropped a bullet into the grey paint storage bag and it came out like a fuzzy Gerbil!
It takes only a few minutes to make a big batch, and I'll test them as soon as I can in my revolvers.