Nope Preacher, I am not going to tediously search for every other source I and others here have encountered that states the obvious, i.e., that shooting a 2 3/4" shell in a 2 1/2" or 2 5/8" chamber generates slightly higher pressure due to the patently obvious fact that the end of the longer shell opening into the bore acts as a partial bore obstruction. And lengthening the forcing cone slightly reduces that constriction.

Your little formula, Boyle's Law, also does not either impress me, or explain why shooting long shells in short chambers results in an increase of chamber pressure. Boyles Law certainly wouldn't apply here anyway. But I guess you think posting it might impress those who think you actually know something besides "Copy-and-Pasting" things you don't really understand. It is good to see (after my prompting) that you have finally stopped posting Barlow's formula since it has virtually no application to bursting pressure for an open ended shotgun barrel. The resulting increase in volume from lengthening a forcing cone is too small to be very significant compared to the effect of forcing the ejecta through the constriction created by the end of the shell opening into the bore. A highly polished forcing cone might provide a small area of reduced friction. But the EXPERT job in your photo is certainly not likely to do much to reduce friction. I think that a machinist like Miller would see the reamer chatter marks and agree with me on that point. Interesting to see you quoting Miller here now. Too bad you didn't do the same all of those times you attempted to falsely put words in his mouth concerning what he said about no prohibition on slavery in the Bible.

Originally Posted by Drew Hause
Yes William, since "because I say so" isn't adequate, I spent the time and money to prove that I was wrong, and admitted such.


BTW: my name is Drew and, unlike yourself, am willing to document my identity. Feel free to use it.

I'd agree that "because I say so" alone isn't adequate to believe anyone here, especially considering the amount of false and incorrect information posted. Your repeated hysteria concerning cracked small bore Flues and Fox Sterlingworth frames is but one small example of false or incorrect info posted by you. But Miller and I gave a pretty clear and simple explanation of how and why lengthening the chambers of vintage shotguns would not and could not result in increased wall thickness at the end of the recut chambers. Miller even posted pictures to illustrate it for you. The fact that you subsequently paid good money to have Briley lengthen a chamber just so you could take actual measurements which proved we were correct should show everyone just how shallow your barrel knowledge, and inability to interpret numbers and facts is. But I already knew that.

And that is the biggest reason why I am not going to waste time providing you links to other sources that state what should be obvious…that fact being a partial constriction or obstruction in the bore directly in front of the chamber is absolutely going to result in increased pressure compared to the same load fired in a longer chamber that is the proper length for the shell being fired. It ain't Rocket Science!


A true sign of mental illness is any gun owner who would vote for an Anti-Gunner like Joe Biden.