A calorie is a measure of energy expenditure and stored energy. The calories referred to in diet (calories eaten) and exercise (calories burned) are kilocalories (kcal). One kilocalorie is equal to the amount of heat that will raise the temperature of one kilogram of water by one degree Celsius at sea level.
Break-In Procedures: 1  Clean barrel after each 3 shot group for the first 60 shots or more if needed. 2  Check to see if there is any visible copper fouling. 3  Take one of the clean dry bore snakes, soak with copper solvent, and run it through the rifle from chamber to muzzle 3 times and let sit for about 10 minutes.
When people talk about a barrel being âshot outâ they typically are referring to the wear that occurs just forward of the chamber in the first 4 inches of the rifling known as the throat. This is a natural phenomenon that occurs in all barrels given enough time, and is due to many factors that will be outlined below.