While some reloaders prioritize safe, cost-effective, and reasonably accurate ammunition using standard practices, others, particularly competition shooters, strive for maximum uniformity in their reloads. The aim is to ensure that all bullets leave the barrel at the same point in the vibration pattern, resulting in consistent shooting. Uniform loads also minimize variations in bullet velocity, which is crucial for consistent trajectories downrange. Even a small change in muzzle velocity can significantly affect bullet drop at long distances. Long-range shooters typically aim for a velocity deviation of no more than 10 fps to maintain precision.

Achieving uniformity in ammunition necessitates consistency in each component and step of the reloading process. In this series of articles, we will begin by exploring the importance of uniformity in casings.

Cases

The objective of case preparation is to achieve uniformity among cases in terms of volume, length, neck and wall thickness, primer pockets, flash holes, and other factors. Different brands of cases may exhibit variations in dimensions, strength, and other characteristics. If velocity is a concern, cases with a lighter average weight can offer greater internal volume, allowing for higher powder loads and increased velocity while maintaining safe pressure levels.

It’s important to note that military cases generally have thicker walls and less case capacity compared to commercial counterparts. To determine case capacity, weighing cases before and after filling them with water can provide direct comparisons, with the weight difference representing the case capacity in grains of water.

The initial step in case preparation involves sorting cases of the same caliber by manufacturer, date of manufacture or lot number, and number of reloads. Each case should be inspected for defects like off-center flash holes or neck and shoulder dents. Some benchrest shooters even measure neck thickness at various points and discard cases with excessive variances, as these variations can affect combustion chamber alignment and overall case uniformity.

To achieve maximum uniformity, further sorting is necessary. This includes sorting once-fired cases of the same lot by weight after trimming, neck turning, and ensuring uniform primer pockets and flash holes. By completing these steps prior to weighing, any differences in case weight reflect variations in case volume.

Many benchrest shooters classify cases into weight classes with no more than a one-grain difference, as cases within the same weight class tend to have similar capacity and are fired together. However, some match shooters rely on shooting tests to distinguish between good and bad cases. Cases that group well are kept, while cases producing flyers are set aside. A combination of weight sorting and shooting tests can be an effective approach.

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