What is the primary goal of ensuring proper obturation on a resized case?

The primary goal of ensuring proper obturation on a resized case is to achieve reliable and safe chambering of the round. Obturation refers to the sealing effect that occurs when the cartridge expands to fit the chamber, preventing gas from escaping around the case during firing. Proper obturation is critical for maintaining accurate pressure levels within the chamber, which in turn ensures that the round can fire reliably and safely. This pressure containment is crucial for the overall performance of the firearm, as it influences accuracy, function, and safety. If obturation is inadequate, it can lead to issues such as misfires or dangerous overpressure conditions.

The other options, while related to firearm performance, do not address the primary concern of obturation. Faster cycling of the action is more about the mechanism of the firearm and does not directly relate to the sealing effect of the case. Increasing the volume of the cartridge does not specifically pertain to obturation, as it focuses more on the physical dimensions than on the sealing capability essential for safety. Reducing recoil is an aspect of design and ammunition choice, but it is not directly influenced by proper obturation of a resized case.