Charles. Are you finding small lead shot ? Or similar small non-ferrous targets? If you are. You are on the right track. A small nugget sounds just like a small lead shot target of almost similar size. If you are finding these. Keep on it. I can dig 100 trash targets before a yellow one shows up. Maybe slow down your swing a bit. Small gold doesn't yell at you. It's a light whisper , but pronounced zip on the MXT.
Once you find your first gold with that unit , it just gets easier. People always say it. The first is the hardest. But it's very very true.
I sometimes use my MXT for small gold but, usually a GMT. But with the MXT I find I have to slow down a bit. It's not as hot on small targets as the GMT.
Hemisteve left a great post, simple. Read it . Again
The 4x6 Shooter is the ticket as far as the MXT on gold goes. No need to change that. In mineralized ground, in Plumas smallest I've found with MXT and 4x6 coil is .8 grain. And it was a whisper . About 1 inch down. WITH good headphones. Not bad . Compared to the GMT , no contest. If I HAD to keep one detector, of all, of them I would probably keep the MXT. No BS. It does everything really good. No other can say that I feel. It doesn't find the smallest, nor the biggest - deepest gold. But it's not designed to do that.
What headset are you using ?
I have hunted the Snelling area on numerous occasions, with less than excellent success . A couple ok finds . Nothing great . Its not far from me , I need to get out that way more, and find new areas. Close drive from home, for a closer foothill hunt.
Family property in Tuolumne and Plumas areas are usually where I prospect..