CPO Shorts
Quick answers to common questions about rifles, optics, ballistics, reloading, ammunition, and hunting. CPO Shorts are designed to explain one concept clearly without overcomplicating it, with links to deeper articles when you want to keep learning.
What Is Parallax?
Parallax is the apparent movement of the reticle across the target when your eye moves behind the scope. Learn what causes it, how to recognize
What Is Point-Blank Range?
Point-blank range is the distance over which a bullet stays within an acceptable vertical window around your line of sight, allowing you to hold center
What Is MOA?
MOA, or Minute of Angle, is an angular measurement shooters use to describe rifle accuracy and make scope adjustments. Learn how MOA works and why
What Is a MIL?
A MIL, or milliradian, is an angular measurement shooters use to describe accuracy and make scope adjustments. Learn how MILs work and why the measurement
What Is Ballistic Coefficient?
Ballistic coefficient, or BC, describes how well a bullet retains velocity in flight. Higher-BC bullets generally slow down less and are affected less by wind
How Far Should I Zero My Hunting Rifle?
There isn’t one perfect zero distance for every hunting rifle. For most modern hunting setups, 100 yards is a simple starting point, while 200 yards
What’s the Difference Between Caliber and Cartridge?
Caliber describes bullet diameter, while cartridge describes the complete ammunition and chambering. Learn the difference and why it matters when buying ammo. What’s the Difference
What Ammo Do I Need to Hunt Deer
Not sure what deer-hunting ammunition to choose? Start with a proven deer load in your cartridge, make sure your rifle shoots it well, and confirm
What Is Muzzle Velocity?
Muzzle velocity is simply the speed of the bullet as it leaves the barrel. It’s usually measured in feet per second, or fps, and it