Coopers do pop from time to time for around the $1200 mark, this one was here the other day for a short time before someone jumped on it -
https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/ubb/showflat/Number/11839659/Searchpage/2/Main/813199/Words/cooper/Search/true/Re:_WTS:_Cooper_57M_Classic

223 Rem, my favorite cartridge - you can't argue with truckloads of dead PD's and gophers.

24hourcampfire.com - The site where there is a problem for every solution.