Blasting

[docfunk]

Whilst caving yesterday I was looking at the blasting marks on the walls of a tight rift and they seem to be 8mm holes with some kind of brass cap in the end,can anyone enlightem me to what explosive is used and how?

 

[Les W]

Sounds like "capping" a common digging technique, best not discussed on a public forum.

PM if you wan't/need more info