FlyFish, I'm with you, dude. I just love collecting brass. And speaking of picking up brass, when I was in hoch schule (high school) near Ft. Hood, TX, I was fortunate to find three 90mm brass artillery cases on the military reservation. I gave one to a friend so I'm down to two. These large brass cases are hard to find because they are now made of steel or a steel alloy.
I'll tell you how addicted I am to finding brass. Between Deckers, CO and Woodland Park, CO, there is a fairly large area (.250 X 3 miles - approx.) in the Pike National Forest where shooters have been going for many years. This is not an organized range. When I go there, I wait for shooters to leave their area and if I don't see them picking up brass, I will make a B line for that spot. I'm perfectly content to sit in my truck and wait. Now and then, I will ask if I may have their brass. If I'm bird dogging someone, I will park as close as I can without upsetting them. The trick is to be close enough so another shooter or brass collector can't ace me out of the spot. And yes, I've even collected brass at night with a flashlight. Some of these shooters shoot until it's almost too dark to shoot.