in the intrest of a ground charge or a mine effect or sumthin in that category, since anfo is pretty availible wat kinda detonator or how many grams of explosive e.g. hmtd, mercury fulminate wuld u need to detonate a charge of say 200g of anfo? (just a simple number to measure it on though to make a decent effect id prob use more)and also wat kinda tube tube thickness wuld u want to attempt

to control the blast upwards to create a nice big expolsion of earth? (and to attempt a resonably safe effect).though i prob may not use anfo i was just wonderin coz other high explosives are hard to keep for long and sum (infact most) dodgy to make