I'm a firm believer in looking at the ground (Or floor) of the ranges I go to to see what brass people just left lying there after they finish. My best day was I went in one empty lane, there were 54 .454 Casull cases and 56 .45 Colt. Went to the next lane and there was a pile of 10mm cases. Next one down a HUGE pile of .357 Mag and .38 special cases. Were all the rich boys who can afford to just chuck their empties there earlier in the day?

Now if I would have only found some .44 mag brass, too.