Gee..You may learn something...Is there something wrong with practicing on know targets?..Art
In my experience, there is. When metal detecting known targets with my detector, I typically get perfect responses each time, both to the type of target and the depth, which is exactly what I expect to find. This is actually the reason I've never put any stock into someone that told me they buried a target in their yard and then, SURPRISE, found it by dowsing! However, I've found that in the field, looking for lost/buried older targets, the responses are never quite alike due to a number of different reasons. I've had situations where, in certain areas, a older copper cent will sound exactly lke a clad cent, but a similar target only 4 or 5 feet away will sound pitch and ID perfect.
I practice by doing, and then learning and adjusting from my mistakes. This is exactly what you've said more than once, try it and then make adjustments and try it again. If i get any kind of reaction at all from my water lines, I have no way of knowing if that reaction was natural, or caused by me knowing that my target is below my feet, and then wanting a response to the point that I cause it myself.
At any rate, my options are pretty limited. If I go out and try dowsing, (which i told you I have done before without success, despite the fact that the people I was dowsing with were firm believers and had been dowsing for many years) either the rods will move, or they won't. That's not really what I'm trying to determine, however. I'd like to have a map dowser take a look at my land to see if there are any unknown targets. Then I can test my rods on those areas, see what kind of respose i get, then go back over it with my detector to see if anything turns up before digging.
Again, if you won't want to try it, then just step aside and let others try.