Reloading ammunition is as old as firearms. Shooters began tinkering with bullets, powder and other components after the first time someone successfully put a projectile in front of powder and squeezed the trigger. Today’s array of reloading equipment certainly makes reloading at home easier and affordable, and it gives retailers a chance to make more money.

Whether you call it reloading or handloading, it’s something most consumers see as a long-term investment. The...