Civil War, Type 1 Williams Cleaner Bullet

• Battle Of Fredericksburg, VA
• December 11th-15th 1862
• Fired every 10th round by Union soldiers to clean their barrels of black powder residue.
• This worked via a zinc plate that expanded due to the intense heat from the black powder explosion. The zinc expanded and physically scraped the black powder residue from the barrel in an instant, allowing union soldiers to crudely clean their rifles in battle.
• The second picture is not of bullets I own, but a picture of an unfired Williams cleaner round.