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VDI numbers for lead?

Grunter

Active member
I have an Explorer SE and found a .69 cal. Confederate Gardner bullet with it a couple of days ago. I was running a wide open screen no discrimination,Pro coil. I vaguely remember the numbers 31-31 coming on the digital screen. I went back to the same site today and all of my 31-31 were barbed wire pieces. What is the usual VDI for lead?
 
Civil war minie balls are listed as 7-23 or 7-24 in the charts I have seen. I have only found two minie balls and they both came up as low 20s conductivity.
 
Thanks Doug, I did an airtest yesterday and got those readings at first laid the bullet on the ground and got a 31-30.
 
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