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Rifles, Reloading, Optics, Equipment
Reloading
Help me figure out why I'm blowing primers
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<blockquote data-quote="aushunter1" data-source="post: 1791922" data-attributes="member: 57533"><p>The aim of reloading imo is to find accuracy nodes not to try & get the most velocity as possible out of the process.</p><p>In the case of having excessive freebore & seating into the lands not possible then the ideal seating depth would be either whatever fits your magazine OR at a depth that still allows the projectile to be held securely in the case mouth.</p><p>Whatever OAL you choose you need to set that before starting the ladder test, after you get a decent grouping you can start changing the CBTO in small increments.</p><p></p><p>Also as someone else pointed out if your primers are not seated to a correct depth then they would be more susceptible to blowing.</p><p>I always uniform the primer pockets before loading, even on new brass!</p><p>Uniforming evens out the pocket depth, not the side walls so you can get maximin depth during seating.</p><p></p><p>In addition all primers are not equal, some have slight variance in their cup thickness & cup diameter.</p><p></p><p>Another thing to check is if you are getting extractor marks on your headstamp area, if you are you are definitely over pressure!</p><p></p><p><a href="https://www.accurateshooter.com/technical-articles/primers-and-pressure-analysis/" target="_blank">https://www.accurateshooter.com/technical-articles/primers-and-pressure-analysis/</a></p></blockquote><p></p>
[QUOTE="aushunter1, post: 1791922, member: 57533"] The aim of reloading imo is to find accuracy nodes not to try & get the most velocity as possible out of the process. In the case of having excessive freebore & seating into the lands not possible then the ideal seating depth would be either whatever fits your magazine OR at a depth that still allows the projectile to be held securely in the case mouth. Whatever OAL you choose you need to set that before starting the ladder test, after you get a decent grouping you can start changing the CBTO in small increments. Also as someone else pointed out if your primers are not seated to a correct depth then they would be more susceptible to blowing. I always uniform the primer pockets before loading, even on new brass! Uniforming evens out the pocket depth, not the side walls so you can get maximin depth during seating. In addition all primers are not equal, some have slight variance in their cup thickness & cup diameter. Another thing to check is if you are getting extractor marks on your headstamp area, if you are you are definitely over pressure! [URL]https://www.accurateshooter.com/technical-articles/primers-and-pressure-analysis/[/URL] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Help me figure out why I'm blowing primers
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