Finally got this thing apart using a primitive bullet puller comprised of a length of 3" PVC pipe with two notches cut out so the pipe could compress around the casing. Combined two 2" hose clamps for the compression ring and pounded it on a board nose down. Now, even though I had never had this apart, I knew that it could have a impact inertia BD fuze so I took the precaution of having it X-rayed first. That said, it took a lot of whacks before it would come apart, but it finally did. Not quite sure what it is other than a 6 Pdr. Case length is 306mm, rimmed base is 76mm, and projectile length is 215mm. If someone could please enlighten me, I would appreciate it. Thanks, Bruce.