Just interested to find out if all rim fire .22lr target shooting clubs follow the guidelines of the NSRA which is to have a sand bullet catcher at the 100yd target frame, or do some clubs just shoot into the berm at the end of the range, and never clean the ground that is being shot into, obviously the sand option is easier to clean/replace over the course of its use, but not so with an earthed up backstop, which can lead to lead pollution of the groundwater, possibly causing problems at a later date, thanks for your opinions on this.Rog