I had 2 duds. Both of them however may have a very good reason for being duds:
Dud #1: Tannerite bottle floating in a lake, shot with Winchester USA 45 grain JHP. Bottle and water flew up into the air, then bottle filled with water and sank within seconds.
Dud #2: Tannerite bottle hung nest to a hornets nest in a tree, shot with a handloaded Hornady 40 gr. V-Max. Bottle burst open showering the ground with the binary ingredients.
I have shot many other bottles with great results, so I have made a couple theories for myself...
Never try to detonate Tannerite through water. The binary may be ruined in a very short time.
Never try to detonate Tannerite with a handloaded, non-chronographed, light bullet. Sure a .30-30 will detonate Tannerite, but perhaps my little handloaded pill didn't have enough juice.
I may have just gotten unlucky with those two bottles, but at $5 a pop I don't want to do any controlled experiments!