Mike Harrel,
The first chamber cast I ever made was also sulfur, but that was 55 years ago and I used common feed/seed store sulfur( reinforced with a piece of "tie wire", maybe that is why it was a different color. They are easy to remove, but it is because they shrink. Cerrosafe shrinks also, but returns to size after a time and more precise measurements can be taken then. If you wait too long to remove it, it will be difficult to remove, but can be melted out with a heat gun. If you never ID the cartridge, you can still load for it, and I agree that you couldn't turn it down. BTY, Jani may be onto something.
Mike
