Tannerite is a (binary) explosive used primarily for firearms practise ...

it is exceptionally stable when subjected to less severe forces like hittin it whit a hammer or when its dropped its supplied as 2 powders wich are combined to produce the explosive
the explosive will not be sold to just anyone but the 2 powders will so when you get your hands on the powders you got yourself some lega tannerite ( as long as its used for personal use)
it should detonate when shot by a high-powered rifle.
Small caliber rimfire or slow moving pistol ammunition will not initiate a detonation.
there are alot videos circulating the net with tannerite being shot (in slow motion)

When you eat dirt for the first time and leave your family to build a shack in the woods