Bart, the Broun-fuzed shell I was referring to (owned by Steve Sylvia) is a 2.9" Read Long-Model shell, not what is in your drawings. The Broun fuze in Steve's shell was definitely an experimental model. It is hugely oversized, in both height and diameter. Also, it has a long thick flange across its top, similar to what is seen on some modernday car gas-tank caps. I think Emike might have one of those Experimental Broun fuzecaps in his collection.
Unfortunately, there does not seem to be a photo of Steve's Read Long-Model shell with the Experimental fuzecap anywhere online. But it is shown on page 245 of the Dickey-&-George 1993 book. Also, it was pictured in an article about it in an old issue of the North/South Trader's Civil War magazine.
You can also see the complete shell on page 71 in Chuck Jones book, "Artillery Fuses Of The Civil War"... along with one of the Experimental Broun fuzecaps... and a nose-fragment from an exploded shell which had the Experimental Broun fuzecap. That nose-frag shows the rounded-wall flat-floored "chamber" we see on Emike's busted-nose shell. So, I believe I've identified Emike's shell correctly... a 2.9" Read Long-Model shell which had the Experimental Broun fuze in its broken-open nose.
Regards,
Pete