Technical Articles

For Optimal Performance You May Need To Change Your Load

Internal Volume of Brass Case

As you know, the exterior dimensions of rifle casings for any given caliber, no matter who makes the casing, are pretty close to the same. SAAMI, the US standards organization, specifies external dimensions, so anybody’s ammo will fit in any gun chambered for that caliber. However SAAMI does not call out internal dimensions. Internal dimensions vary considerably among casing makers. And as internal dimensions change, so does internal volume.

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Weight Sorting – Fact or Fiction

Weight sorting is not the best way to determine internal volume consistency.

Long-distance and competition shooters know that putting multiple bullets in the same hole at the target requires CONSISTENCY in the components that make up the round. You need consistency in the powder charge, consistency in the bullets, and as it relates to the brass casings, the most important feature is consistent INTERNAL VOLUME.

Most hand loaders know this. And they would like for there to be an easy way to determine internal volume consistency. Weight sorting is easy, but its only merit is that it is easy. It isn’t necessarily accurate.

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Head Ripping Issue Caused by a Fluted Chamber

Recently a shooter sent us their fired Peterson Cartridge .260 Remington casings to make us aware of an issue that they were having with the brass. The casings had chunks missing out of the heads. This had us concerned that the case-heads were splitting, cracking, or had some other unknown issue.  Derek Peterson, the president here at Peterson Cartridge, investigated the issue and ultimately found that the cause was due to the casings being shot out of a “fluted chamber”. We thought this information would be valuable for fellow shooters and wanted to share what we learned.

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What happens to Case Neck Tension after repeated firings?

Do you think neck tension on brass rifle casings increases or decreases with continued firings from the same casing?

At Peterson Cartridge, many of our customers are long-distance, competition shooters who reload and re-shoot our casings over and over again. Neck tension is one of the variables in the formula for winning performance. And all the variables matter to these shooters. In an effort to continue being a valuable resource to these shooters, we set out to answer the question, “What happens to Case Neck Tension after repeated firings?” And, “Does that have any influence over velocity?”

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