Both Gulandi 16 wads will work in the 16 2 & 1/2” Cheddite, not as nice as the DR-16, but they are a suitable alternative. BP sells them as does or did Grafs and Precision reloading. Nick Sisley published some time ago in Skeet Shooting magazine loads so for RST/Cheddite, now in Hogdons Reloading, using then PB and 7625 along with International and Universal, using the DR and Gulandi wads. Some of us use 20/28 as well as Green Dot. Good luck.