This doesn't mean, however, that a typical hunting rifle must be fired dozens of times before it's ready to be taken afield. Usually, the accuracy improvement from breaking it in is not all that significant or necessary. In virtually all examples, by the time a rifle has been sighted-in at the range it is ready for the hunt. More important is checking such hunting essentials as smooth and reliable feeding, proper operation of the safety and other mechanical details. Also, when breaking in a centerfire hunting rifle, be sure to let the barrel cool between test groups, checking to see if there is a tendency to shift point of aim as the barrel heats. In some instances sighting-in with a hot barrel can result in a false zero.