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Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs/chronographing
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<blockquote data-quote=".280Rem" data-source="post: 207364" data-attributes="member: 11140"><p>Generally speaking, yes primers can affect pressures with little gain in velocity. But, most problems in reloading can be headed off by working up your loads as recommended. Changing primers under the same powder charge and bullet you've been shooting can cause a problem, depending on the other factors. </p><p> </p><p>In fact primers and their effect are largely un predictable. In some cases a hotter primer can lower velocity, and raise pressure, and a cooler primer vice versa. The key to it all is working up the load with components remaining the same, and watching your velocity, then your brass. </p><p> </p><p>Recently read a post on another site where a guy was loading for the 30-06 with 180s and H4350. Said he hit @ 2730fps some 2.5 grains below "book max". He's started 6.5 grains under max at 2550, and jumped 2 grains of powder and nearly 200fps to the 2730 level with the first and second batch. But since the book said he could add 2.5 more grains, he added 2 more, and got a chrony reading of 2900 fps, and a VERY sticky bolt and extraction with a 180 in a 30-06! I told him that had I been watching the chrony, I'd have stopped at the second loading due to the velocity. And that just goes to show you how worthless a "book max" powder charge is to safety. Had he gone ahead and loaded to "book max" he may have damaged his gun, or worse! The chronograph is your friend IF you use it correctly.</p></blockquote><p></p>
[QUOTE=".280Rem, post: 207364, member: 11140"] Generally speaking, yes primers can affect pressures with little gain in velocity. But, most problems in reloading can be headed off by working up your loads as recommended. Changing primers under the same powder charge and bullet you've been shooting can cause a problem, depending on the other factors. In fact primers and their effect are largely un predictable. In some cases a hotter primer can lower velocity, and raise pressure, and a cooler primer vice versa. The key to it all is working up the load with components remaining the same, and watching your velocity, then your brass. Recently read a post on another site where a guy was loading for the 30-06 with 180s and H4350. Said he hit @ 2730fps some 2.5 grains below "book max". He's started 6.5 grains under max at 2550, and jumped 2 grains of powder and nearly 200fps to the 2730 level with the first and second batch. But since the book said he could add 2.5 more grains, he added 2 more, and got a chrony reading of 2900 fps, and a VERY sticky bolt and extraction with a 180 in a 30-06! I told him that had I been watching the chrony, I'd have stopped at the second loading due to the velocity. And that just goes to show you how worthless a "book max" powder charge is to safety. Had he gone ahead and loaded to "book max" he may have damaged his gun, or worse! The chronograph is your friend IF you use it correctly. [/QUOTE]
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Pressure signs/chronographing
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