A reloading data chart displays critical performance data for hand-loaded rounds. Professional and hobby shooters, as well as hunters, can use this data to determine the ideal bullet and powder charge for their needs.
A typical reloading data chart for a particular caliber lists popular bullet designs and powder types. Based off these two variables, as well as different amounts of powder, it displays the estimated muzzle velocity of a round.
The data chart also displays the estimated pressure of a fired round. This data is critical as it prevents the creation of a round that could damage a firearm.