I buy my Knights plastic Disc' s from www.midsouthshooterssupply.com or www.natchezss.com.

The discs can be used more then once. Of course Knight sells them and they recommend a new one for each shot.If I' m at the range I might use them more then once. Hunting it' s a one shot deal. Use and replace it.It' s not worth taking chances to save a couple penny' s.
Ruger Redhawk