The Royal Armouries have verified the identification as the terminal from a musket accessory (scourer) used to clear out the barrel of a musket. The diameter suggests it was used with a “caliver” a form of the arquebus from the early part of the 17th century. Designated a Find of Note: County importance.
Musket scourer
Photo: The Portable Antiquities Scheme CC By 2.0
Object type: Musket
Period: Post Medieval
Primary material: Iron
Date found: 11/04/2022
Location: Whitehill, Hampshire