Aloha Ron,
The 800kg bomb used by high-level bombers AT PEARL HARBOR was made from a lathe-turned 16 inch naval shell.
The 800kg bomb used by high-level bombers LATER IN THE WAR was NOT made from the 16 inch naval shell. It had a steel casing with large rivets.
These were two DIFFERENT weapons.
The 800kg bomb used at Pearl had a taper...the other weapon did NOT have a taper.
Here is the weapon used at Pearl Harbor... http://groups.msn.com/japanesemodelaircraf...amp;PhotoID=337
Here is the weapon used later...
http://groups.msn.com/japanesemodelaircraf...amp;PhotoID=334
HTH,
David