I have been contemplating a new way to fire form brass. Call me crazy, but I don't like the idea of cream of wheat and toilet paper in a custom barrel! I thought about designing a nicely machined firing chamber in a short barrel (same caliber) using the same reamer that ground my chamber. Then using light loads and a small hammer driven firing pin to launch an appropriately sized rubber/plastic projectile (SAFELY!) Ta Daa! Case fire formed! However, before blowing myself up, breaking the law, and dialing 91 and putting my finger on the one, I decided to research. I came up with this. Almost exactly what I was thinking of (see pics). Does anyone have any experience with this type of fire forming method? I understand ballistics, and realize that even one trip to the hospital/jail is way more expensive than a new barrel. Here are my thoughts: - if a device like this can be used safely/legally, it would help extend barrel life - since the chambers are theoretically exactly the same it should fire form the cases nicely - I know light loads can be a problem d/t inappropriate interaction of the case wall and the chamber wall (more backward thrust and flattened primers, case head separation etc. - some type of safe projectile has to be used since this pressure is what expands the case appropriately. Safety is #1 Barrel life is at a premium, now more than ever I don't like "glued-together-contraptions", but a well though out tool is what I want This is clearly not a new idea, so any help appreciated! Don't crucify me, it is just an idea!