The main ingredients of Tannerite are aluminum powder and ammonium nitrate. There is some other stuff as well but go look up the patent if you want the details.
Just ammonium nitrate and the right kind of aluminum powder mixed in the correct proportions will detonate via a high velocity rifle bullet. It won’t detonate as easily as Tannerite (or Boomerite) but it can be made to detonate. I’ve done it.
The tough part of doing this on your own without an ATF license to manufacture high explosives is getting the correct type of Al powder (you can get the AN from cold packs). I haven’t tried it yet but someone claims they have done it with a rock tumbler and Al foil.
It looks plausible even if it does take a week in the tumbler.
Basically you shred a bunch of Al foil by hand, put it in a rock tumbler with some carbon and large ball bearings, then let the tumbler do it’s job for a week. Out comes “German Dark Aluminum Powder”.
Another law (restrictions on German Dark Al) made to look silly by low tech tools and procedures.