They do, much like a Fio 616.

No matter to me, they load fine and I dedicate a batch of hulls to this primer.

The Cheddite piercing problem as far as I'm concerned is because of a too thin cap cover.

The W209 does not do this.

I will say this... the Cheddite primer is a very sensitive primer. I set one off in a MEC 650.

If you have an old gun with a tired mainspring, they might be just the thing.

"The price of good shotgunnery is constant practice" - Fred Kimble