The smaller pellets are called

Pellets Pellets are made of lead. Large pellets are called 'buck shot' or 'mould shot' and the catridge contains 9-12 such pellets. The diameter is 6-8 mm. The smaller pellets are called 'bird shot' and the catridge contains 300-400 pellets. Their diameter is 1-3.5 mm. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 140