Remember, these are just my opinions, but they reflect how I often hunt or the decisions zi make to hunt.
homebre said:
I had some spare time and the weather was nice so I decided to go thru my fields and woods and hunt in all metal.
Why? What were you looking for, and was there anything special about the site in the woods? Which search coil did you use? Just curious.
homebre said:
This is not a trashy area. All I found was some old wire, a big bolt, and one rusted can, ...
It sounds like you found trash as you didn't mention anything worthwhile.
homebre said:
I was wondering, are there any reasons to hunt in all metal mode with the Vaq if you do not want to find iron?
No, not really. I often search in a Threshold-based All Metal mode, even at many sites that have a fair amount of trash. The reason I do it is so I can hear ALL metal targets present. That lets me know if the site is barren, lightly trashy or very trashy. Also, when I encounter a target I use detectors that let me quickly access a Discriminate mode [size=small](with a toggle, touchpad or pushbutton)[/size] to check the located target, and also to work the search coil around the trash to see if there might b e a desired target close-by and partially masked.
You don't have that option on the Vaquero because you have to turn the knob and shift out of a Discriminate setting to go into All Metal, or shift out of All Metal and try to find a Discriminate setting that works for where you are. That's why my Tesoro's are an Outlaw and Bandido II µMAX.
If you know a site has some iron trash, and if you don't want to find it and/or hear it, then just select the Discriminate mode and increase the Discrimination level carefully, just to the point where you reject the more problem trash.
homebre said:
Is the depth substantially greater or just a 1/2 inch or so with all metal?
It can be a little greater in good ground conditions, or bad, depending upon the GB adjustment. Depth, to me, isn't such a big issue in the long run since I have found the bulk of my good targets from surface to about 4"-5". If you use the highest Sensitivity level possible, and the lowest Discrimination level on the Vaquero, the depth of detection most people would h4ar would be very close.
homebre said:
It seems I should just use Disc above iron and below nickel. Comments?
If you don't want to find trash, then use only enough Discrimination to deal with the most offending trash targets. Personally, I never use more Discrimination than just enough to reject iron nails. That's it. I wouldn't suggest a setting described as "below nickels" since that can be a very high setting and will also be rejecting small to medium gold jewelry, and cause more good target masking in a littered environment.
Go hunt it some more, but use your Discriminate mode, with only enough Discrimination to reject a nail or two placed on top of the ground. Then make sure you are Ground Balanced and remember to overlap at least 50% of the coil on each pass of the search coil.
Monte