Discrimination and Notch

If you are hunting an area with a ton of nails and you have limited time, about the only choice a person has is to discriminate out the nails and hunt the rest or use the notch feature. Normally, I would hunt and dig the nails then go back over the area and will usually find some "good stuff" that was being masked by the nails. So if you discriminate or notch the small iron, will the items under the nails still be masked? I am getting ready to go into an old home site that I may not have the opportunity to hunt again and I know there are nails everywhere. I have been there before I started detecting and you can see the nails laying on the ground. My first step will be to drag a powerful magnet across the ground and pick up as much surface iron as I can but I know that will only get a few of the nails there.