What could result from not resizing brass cases before reloading?

Brass cases should be resized before reloading to ensure they fit properly in the chamber of the firearm. When brass is fired, it expands to the dimensions of the chamber. If the brass cases are not resized, they may remain too large or out of shape, leading to difficulty in chambering the round. This can result in jamming, misfires, or failure to load, which can be dangerous and negatively impact overall shooting performance.

Resizing the brass brings it back to the correct dimensions, allowing for smooth insertion into the chamber and reliable cycling of the firearm. Therefore, not resizing can lead to significant issues during operation that can compromise both safety and functionality.