Hi XT-70 TH,
I think because there are so many variables with jewelry that a set number will be much more difficult.
I know my wedding bank will hit a 16/18, whereas my wife's engagement ring jumps all over the place.
Boy I sure wish it could be that easy, but we are destined to dig pulltabs if we want the goodies also.
I often read if the signal repeats and you don't jump more than 1 notch, dig it.
But as my wife's ring shows ya never know till you dig.
I can hear a double beep with a pulltap with 6 inch HF DD often.
My Grandaughter is collecting can poptops for school, I think I'll be her biggest contributor.LOL
Thanks for all your good info for us XTerra people, I've read them all.
Good Luck,
Ron