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Long Range Hunting & Shooting
6.5 PRC 20" Barrel Reload Questions
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<blockquote data-quote="MtnMann" data-source="post: 2928872" data-attributes="member: 113169"><p>I see potentially two primary variables at play that may be giving you some issues and causing the results on target:</p><p></p><p>1. Hornady and lapua brass have different case thicknesses/alloy make up which makes the internal case capacity vary between the two brands. This can cause differing pressure spikes between the two brass brands leading to more or less velocity when using the same powder charge. </p><p></p><p>2. While lapua brass is very consistent and high quality it is still beneficial to have at least 1 firing, and ideally 2 firings, on the brass before settling on a load as the brass is still slightly changing to fit your chamber dimensions. From my experience this typically causing the case to expand creating slightly more internal case capacity and will change the harmonics of the load as well as possibly lower velocity.</p></blockquote><p></p>
[QUOTE="MtnMann, post: 2928872, member: 113169"] I see potentially two primary variables at play that may be giving you some issues and causing the results on target: 1. Hornady and lapua brass have different case thicknesses/alloy make up which makes the internal case capacity vary between the two brands. This can cause differing pressure spikes between the two brass brands leading to more or less velocity when using the same powder charge. 2. While lapua brass is very consistent and high quality it is still beneficial to have at least 1 firing, and ideally 2 firings, on the brass before settling on a load as the brass is still slightly changing to fit your chamber dimensions. From my experience this typically causing the case to expand creating slightly more internal case capacity and will change the harmonics of the load as well as possibly lower velocity. [/QUOTE]
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6.5 PRC 20" Barrel Reload Questions
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