I have a book that details how and were to place explosives for maxim effect. It also goes into building trenches and bunkers
I blew up a dead tree in February, with flash powder though, not with nitro. I put the load near the ground and it made a "THUMP!" sound in the snow. It was 200 grams (almost ½lb) of potassium chlorate and German Black. 
WTF is German Black??
isn't helping me here. Do you mean Black Powder?? Where do you get large ammounts of potasium chlorate??
German Black is a special kind of pyro aluminium. In the US it's more known as Indian Black or Dark Pyro Al: Aluminium powder
I buy my chemicals over the net. Surprisingly enough they're still license free. 
Dou you know which is more explosive, the Aluminum powder, or Magnesium?? I still have about 20 lbs of Mg from when I worked for Tilton Engineering.
It depends on the particle size. My German Black is 3 µm, the finest you can get. Magnesium is more violent, if the particles are small enough. For magnesium the particles don't need to be that extremely small. You can use potassium
perchlorate as an oxidizer as well. It is not really as reactive but safer to handle.
In the US you have this supplier:
United Nuclear