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.
Could you please provide a link to your assertion that "every other source" explains that "a lengthened forcing cone simply gives less of a partial bore obstruction created by the end of the shell opening into the bore, so naturally there would be a slight reduction in pressure at that point."
Should be easy to find, and possibly accompanied by the credentials of the source. Or a formula would be nice; like P ∝1/V
Start with Miller's comment here
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=37158&page=2"Changing the forcing cone angle (lengthening) would give a very "Slight" increase of volume in the area, which would tend to slightly decrease pressure. A "Slight" change in friction could also accomplish the same purpose."
BTW: my name is Drew and, unlike yourself, am willing to document my identity. Feel free to use it.
