What will be the procedure? Shoot one shot, find it in the medium, record the data and repeat? Guess the medium (clay)would need to be remixed before another shot to eliminate the void from the first shot? Would it be better to use a spackle bucket filled with packed sand, complete with lid made of material, maybe tarp material, held in place by the lid from which the center has been cut, the bucket then turned horizontally? That way the sand would be held in place, the bullet would pierce the material, the medium would not have a void, the data could be collected and the material moved for the next shot and resecured with the lid. I wonder if a metal detector could be used to pinpoint the location of the bullet in the horizontal bucket to get that data, then dump the bucket through a rat wire "strainer" to another bucket thereby catchingthe bullet, and the lid resecured for the next shot?