Chicagobulls567 wrote:
> The bullet on the left is 10 cm tall, with a diameter of 4 cm.
> The bullet on the right is 6 cm tall, with a diameter of 3 cm.
The US penny in the photo shows your measurements of the bullets are entirely incorrect. A penny's diameter is 19mm (1.9cm), which is approximately .75-inch (3/4-inch). A 10cm tall bullet is 2.5-inches tall, and a 6cm tall bullet is 1.5-inches tall... and neither of your bullets are that tall. Even if you meant to say millimeters instead of centimeters, that's still wrong, because a 10mm tall bullet is a little under 4/10ths-inch tall, and a 6mm bullet is a little under 1/4-inch tall. The penny shows neither of your bullets are that size.
Comparing your bullets' sizes with the penny, I'd estimate that the larger one is a .45-caliber to .50-caliber, and the smaller one is .22-caliber or .25-caliber.
Neither of your bullets is from the civil war era. The .22 or .25-caliber one appears to be a "copper-jacketed" bullet, and copper-jacketed .22 or .25-caliber bullets are strictly 20th-Century.
We'll need correct measurements of the larger bullet's diameter and length to ID it and tell whether it is from the latter-1800s or the 20th-Century.
By the way:
The smaller bullet shows multiple tiny parallel ridges inside its body-groove. That is called a "reeded groove" or "reeded cannelure" or "knurled cannelure." That did not exist on bullets until about 1880, so when you see multiple tiny parallel ridges in a bullet's body-groove, the bullet is from later than the civil war.