Aaron Kepley, the incoming director of the Rowan Museum, verified the bullets authenticity.
"These were invented in 1847 in France. By the time of the Civil War, all infantry weapons used these," Kepley said.
Kepley said the bullets are all muzzle loader bullets from the late 1800s and early 1900s.
"The fact that it was found by kids is awesome, because this is giving me a chance to explain to them the difference in the bullets and stuff like that," Kepley said.
Kepley said the Fraley family's home sits on land that used to be an old hunting club and because these bullets are a smaller caliber, they may have been used for target practice.
"Pretty significant that there's so many of them and all of them have been shot too," Kepley said.
Macallister and his younger brothers plan to go back out in the yard to look for more.
It's up to the family whether they want to keep their discovery or donate it to a museum.
Kepley said finding historical objects like this on your own property, makes them yours.