[null and void]

If it was a sabot round, how do you ballistically fingerprint it? The rifling marks would be in the discarded sabot.

Yep. In this case we know where the shooter was and what direction the weapon was pointed.

Look down range from the point of origin, it will be within a dozen or so yards of the muzzle, and within maybe 10-15° of the aim direction.

You could match powder residue, but considering there’s probably very few brands of black powder, that may not mean much.

Yes, but our betters require microtaggents in black powder.

This provides the ability to trace to a single batch of powder.

[Tailback]

I get your point. Then you trace the credit card purchases at each store that recieved a shipment of that batch of powder.

[redgolum]

Is the micro tags just in true black powder, or is it in things like Blackhorn also?