My best single coin find is an AU 50 walking liberty from 1934-d, but the best i did was getting 2 bags or dimes and a bag of Quartars and nickels from a bank in one sitting and getting 188 silver dimes from it and 45 silver quartars, 42 silver nickels and 35 readable buffalo nickels.
Cause sometimes I'm in the mood.... https://www.cointalk.com/threads/roll-searchers-post-your-results.10176/page-234#post-828271