[Targan]

Here are some old threads that talk about reloading ammo and have some references to the use of black powder:

Improvised ammunition

Ammo reloading

Pictures of homemade guns

Improvised weapons and equipment

Post-exchange gunpowder production

Black powder

And here's a few threads that talk about modifying military vehicles:

Modified vehicles in T2K

Gun trucks

Using captured vehicles

M551A2 Sheridan

Questions about home guard/militia units

And this thread has elements of both:

Surplus armor in T2K