Best Coil for Deep Silver -Ace 350

[thekillfloor]

Hello all. I am a n00b and need some help please. I purchased a Garrett ace 350 and am using the stock coil and at pro pinpointer. My goal is to find old silver coins (I'm spending too much on eBay) I've been told that the stock coil on my MD probably isn't best to reach the depths that I would need to dig. Any advice on a coil upgrade?

 

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[enamel7]

Maybe try posting in the metal detecting forum.