I won't throw any stones, but I would not think most 10-year olds could handle a .45. That's alot of gun
I started with a surplus 8mm Mauser!
After learning to shoot on a rifle with a steel butt plate that kicks like a mule, a .45 isn't so tough to control. Plus, with a bolt action it isn't going to go off again if you accidentally leave your finger on the trigger when the recoil dazes you.