Could someone id these projectiles? One is 261mm the other 266mm in length. Diameter 74mm, driving band diameter 77mm,width of db is 13.5mm and starts 42mm from the base. Also, there are wooden "lifting plugs" threaded into the fuse wells and one has the C broad arrow mark with an A on each side. Threads are 36mm. And the brass caps on the bottoms of these shells are for? Sorry if the images are not the best. New camera. Any help would be appreciated.