I was discussing shaders in general, and not just those used on Chunk guns, Papa. I have seen all that both of us have described, and like you, go a little nuts trying to figure out what comforms to some rules, and what doesn't. I have seen full length shaders on chunk guns made of copper, aluminum, steel, cardboard, and PVC. I probably have seen other materials used, but have since forgotten them. When you talk to the shooters, you find out that all the shaders in the world aren't going to be much help unless you can put your ball through that "x". My brother won one of the ten targets at the Sgt. York Memorial Chunk Gun Match this Spring, and actually shot a respectable group, considering his limited time shooting the gun in practice. He is getting his form back, and solving a lot of those little problems that interfere with shooting small strings. I expect him to do better next year. He's got to be more consistent for 10 consecutive shots to begin to really move up, but I see that is coming. He has built a couple of .40 cal. underhammer guns in the past 6 months, and I think he is considering changing the gun he shoots at the match for next year. So far, the shader he made out of PVC tubing has worked well. We have talked about him using aluminum or copper plate to make a new shader.