Re: nickels & ol' yeller
My ace 250 is my first ever machine and I have been having fun with it for about 4 months. When you pass over a nickel (and we all do) it makes a different sound than other US coins. While pennies, dimes and quarters will give off the distinctive casino "belltone" response like so, "ding-ding-ding," the nickel's sound is more akin to trash "iiiiiip" When hunting in your average environment (soccer field, park, sidewalk lawn) we are likely to associate the nickel sound with a pull tab or bottle cap and so in these trash- producing fields we inevitably tune-out the nickel sound after a while. In fact some of us notch out the nickel altogether in the coin mode to avoid bending over to dig pull-tabs.
I must add that, yes, you do so at your own risk of possibly passing right over a gold ring, pendant or charm.

A couple of days ago, I went to a university campus that is being torn down. It closed this past April and it had it's start in the mid-twenties. Now, I have yet to find the old coins (I hate when that happens) but I did find an area that produces pockets full of clad. I mean it's everywhere. Now in this circumstance, I found three or four nickels (no gold) and because I was rewarded with a coin on nearly every repeatable signal I found that I could actually discern a nickel sound from a trash "nickel" sound. I hope I'm making myself clear.
What has me excited (and that's why I think that for every m.d. site that we lose another is gained) is a house from 1910 that is being restored. It looks like they scraped about 3 inches of dirt off the driveway and piled it up on the front lawn. I want to hit that area hard and early as I have a feeling it will produce. Well thanks for reading and message me if you want to hash.