Hi all and thankyou in advance. I have been loaned a minelab x terra 705 to try my hand at metal detecting. Now I have been told that this machine isnt great for gold detecting. Im ok at the moment just pulling out bullet casings and nails etc whilst I am learning. My question would be if I was to update am I better spending the money on a new detector or for a next step get a gold coil for this machine. What is your opinion?