spherical lead

If the grenade strikes an object after this time a spherical lead shot filled impact weight will trigger detonation.

Cartridges consisted of a spherical lead ball wrapped in a paper cartridge which also held the gunpowder propellant.

The original musket bullet was a spherical lead ball smaller than the bore, wrapped in a loosely fitted paper patch which served to hold the bullet in the barrel firmly upon the powder.

The combination of length, weight and shape of a projectile determines the twist rate needed to stabilize it - barrels intended for short, large-diameter projectiles like spherical lead balls require a very low twist rate, such as 1 turn in 48 inches (122 cm).