They are Cheddite, I've shot and loaded about a flat of them with no issues. In my SxS Dickinson I end up using about 1 tube tighter constriction with the Herters than with my reloads for backyard clays.
Good to know.
The factory Herter's makes patterns IC-LM in my Ithaca M37 Modified barrel. It is a sweet pattern for upland hunting.
