This bullet, as the final of four pictures shows, was clearly pulled from the barrel of the musket. A bullet would be pulled (or wormed) when the gun misfired or when it got stuck somewhere down the length of the barrel after firing. Muskets were often equipped with ramrods that could accommodate screw-devices able to burrow into soft (and often hot) lead. The bullet would then be removed from the barrel.
That's what you see here. This dropped bullet has a nice patina, cone cavity and maybe one tiny nick that looks to have occurred before or while buried.
This relic was found in Aldie, Virginia on private property.
All firearms sold are pre-1898 and historic collectibles. They are not meant to be fired. Jim Stanley & Associates (cwartifax.com) will not be liable for injury incurred due to any weapon or artifact purchased from this site. All artillery projectiles sold by Jim Stanley & Associates are absolutely safe and have been professionally and safely de-activated.