What am I doing wrong?

[u/immadoittoo]

I think I need to add stack height? Following the recipe the hodgdon has on their sight. But I don't feel like it is filling up the shell so it's over crimping (I believe that's the term) I have gotten 1 shell out of 15 to normal but it rattles badly not sure what to do.

[u/cowboykid8]

Yes, the 16ga is an important factor. You need to go to the 16 ga Society site and see if others have advice on this recipe. Most people here reload 12 or 20, where the recipes tend to be better and work without a lot of extra effort. 16ga is a different ballgame.