Need help how to determine this.

[minDtwisteR]

Hi to all hunters,

Can you help me how to determine this kind of rock, i will show you later. This rock have many engraved and forming a symble something like letter V and straight line. We start digging this a month ago and found this i think we're near in the entrance but unfortionately i was trap with the huge boulder rock so i was thinking that i need to find a way so i research again in the web and learn the idea of how to douse so decided to make my own dowser so i started to dowsing my site and i found a vintage bottle in the X spot of the dowser, i just want your openion or idea for the pro hunter like you to identify about this so that we can dig safe. Cause i'm a biggener only in terms of treasure hunting.

I also found a empty shell in our treasure site not so deep, i think this is from machingun using the JIA during WW2. This empty shells have a code 4 3 T W rounded in the side of firing pin or trigger point. Can someone help me what kind of gun is this and where it came from.

Pls. See the attached photo below.

Any help is very much appreciated. TIA

Br.