Hello Jerry,
I began bottling before I began relic/coin hunting. In the Quattro forum you'll find some of my posts which show some of my finds with the detector. In this forum, I've posted pics of some of the bottles I've found. Most of my bottles were found in dumps running along the side of a hill, off a house site above about 5 to 6 metres. But I've come across dumps found by other hunters, and some of these were holes as deep as 12 feet. I will drop into these holes if I know I can get out again, and found a few bottles that went unnoticed. Bottles used to be thrown down some of the mine shafts, and I've looked down some of these shafts and there are bottles laying on the ground, about 20 metres or more deep. But you need ropes to get down there, and I do have a concern about 'bad air', if you know what I mean. If you are finding bottles at the beach, as the sand washes off, there may be a lot more hidden than you know. I found a bottle dump by accident using my metal detector, going for another sound. You just might be able to stumble on more bottles this way, detecting for other sounds.
Angela