Reading a Ballistics Chart: Velocity, Energy, Drop and Wind Without Getting Lost

A ballistics chart is a table of what a load does at different distances. Four columns matter most: velocity, energy, drop and wind drift.

Velocity is how fast the bullet is moving, in feet per second. Typical .223 loads leave a 20-inch barrel at roughly 2,900 to 3,300 feet per second, depending on bullet weight, and the box lists the figure for each load, including the hollow-point loads at 223 hollow point ammo.

Heavier bullets in the same cartridge are slower. The .303 British, at 303 british ammo, was designed in the 1880s and generally gives lower velocities than newer .30-caliber rounds such as the .308 Winchester.

Energy is the bullet's weight times its velocity squared, divided by 450,240, which gives foot-pounds. A 55-grain bullet at 3,200 feet per second carries about 1,250 foot-pounds. A 165-grain .308 bullet at 2,700 feet per second carries about 2,670, and the .308's 165-grain loads are at 308 165 grain ammo.

A 180-grain bullet from a .300 Winchester Magnum at 2,960 feet per second carries about 3,500 foot-pounds. Federal's loads for it are at federal 300 win mag ammo. Energy is a useful comparison, but it does not predict how a bullet performs on an animal.

Every bullet falls under gravity at the same rate, so a faster or more efficient bullet drops less over the same distance. Anyone who wants to buy 224 valkyrie ammo is looking at a cartridge built for exactly that: long, aerodynamic bullets that hold their speed.

Wind pushes a bullet sideways, and slow or draggy bullets drift the most. The .270, at 270 ammunition, has long had a reputation for a flat path. So does the .280 Remington, with 140-grain loads at 280 140 grain ammo.

The .243 Winchester, at hornady 243 ammo, pairs light bullets with high velocity, so its drop is small at moderate range, even though light bullets are more affected by wind.

Sound travels at about 1,100 feet per second at sea level. The 300 Blackout is loaded both ways, with light supersonic bullets and heavy subsonic ones, and its polymer-tip loads are at 300 blackout polymer tip ammo.

Charts come from a test barrel and standard conditions. Your rifle, its barrel length and the day's temperature will change the numbers, so chronograph a load before you rely on it for a long shot. Published velocities for the 300 WSM, whose loads are at 300 wsm ammo for sale, come from a test barrel that is often 24 inches long, and a shorter hunting barrel will give less.

Ballistic numbers are calculations or test results, not promises. Verify any load in your own rifle, and confirm current stock and state shipping restrictions before ordering.