The general details and method of filling of this shell are given in Pamphlet No. 7. The fol-lowing metallurgical details are now available:–

The body is of composite construction, the ogival head being welded to the cylindrical portion at the shoulder. Both component parts are machined from rolled bar and harde-ned. The Vickers Diamond Hardness figures vary from approximately 800 at the nose to 400 at the base.

The cap is dome-shaped or hut upset from rolled bar and is hardened only at the forward part. The V.D.H. figure varies from about at 630 at the nose to 200 at the skirt. The cap is attached to the shell by lead-tin solder. A band of knurling is formed above cannelure for the attachment of the ballistic cap.

The ballistic cap is pressed from dead mild steel sheet of about 0.04 inch thickness.