No experience finding property markers but a ton of experience cherry picking iron relics, which is the basic skill you need here.
Conductive, Iron mask -14, gain 10, deep on, fast off, and the rest whatever you prefer. With an Ironmask of -14 your detector will still block out the small iron, maybe false a bit, but nothing that should stop you too often thinking it's the marker. Air test some iron about the same size and you'll see with this setting solid iron targets will still override the discrimination and the sound breaks through. It's also a fairly distinctive sound. The factors that come into play is the surface area of the top of the steak, especially if it's straight up and down, and how deep it is. If those factors are in your favor you will most likely get an unmistakable solid repeating sound from all angles. When I get this sound at my old sites I know it's a target worth chasing because I know it's a solid chunk, and how all my cannonballs and trade axes came in. Now if the factors are not in your favor chances are you will get a solid tone one way and not the other. Again it's a sound that you can tell is a piece of iron overriding the discrimination and worth looking into. These type signals at my old sites would be something larger than nails, probably a small to medium size relic. I tend to not chase them because the odds aren't great it's something good, but in your situation it is very possible it's what you will hear. Now if you don't find it then drop down to IM -16 (open screen) and try that way, but you'll be hearing all the metal in the ground if there is any, but might get you the extra few inches you need if you missed it because it's deep. Again, put those settings on and play around for 20 minutes in your yard and you'll see what types of targets will still break through and what kind of range you have. For several years I avoided iron completely because I thought it was an all or nothing type thing... dig it all and maybe get a relic, or leave it and not waste your time. It was only when I got a wake up call of a decent iron find right beside me did I make it my mission to learn more about how to find iron, and it wasn't that long before I started seeing how a small amount of disc. was the perfect setting to leave the small stuff behind like nails, and dig the bigger chunks. It's too bad I can not show you all this in person because this detector is absolutely killer for cherry picking iron. Other brands don't null and have the same type of disc. and obviously you still can find large iron, but you have to dig way more crap in the process. Again if I could just show someone this in person at my early sites they would be a believer.
