You are wrong about the wire - the nosecone is a three-layer sandwich, forming the circuit. That's why the chain-link works; it shorts the inner and outer layers, and grounds the charge.
Every PG-7 I've taken apart has a Piezio point switch with the flat wire running to the base det of the shape charge. It don't detonate at the point. Please splain again what yer talking about....?
actually from what I've read they use a fence so when the RPG goes thru it the fence breaks off the tail fins and it goes off course