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The Range
Ammo & Reloading
9MM OAL question
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<blockquote data-quote="Mitch H." data-source="post: 1593910" data-attributes="member: 5662"><p>The Lyman data is a little bit misleading. Their load data is used for the molds they sell. Our 147gr. 9mm bullet works best at around 1.13" OAL. </p><p></p><p>When working up a load for a new bullet or powder, I always check multiple sources of load data to get a GENERAL idea of where to start. Work the load up SLOWLY, check for signs of over-pressure and chronograph to verify the needed result.</p><p></p><p>ETA: To answer the OP's question, don't worry about the vast difference in OAL unless you are loading to max velocities. You will see the variance due to using mixed brass. There is even a little bit of variance when using the same headstamp brass. For plinking purposes, I usually stay right around the starting load data.</p></blockquote><p></p>
[QUOTE="Mitch H., post: 1593910, member: 5662"] The Lyman data is a little bit misleading. Their load data is used for the molds they sell. Our 147gr. 9mm bullet works best at around 1.13" OAL. When working up a load for a new bullet or powder, I always check multiple sources of load data to get a GENERAL idea of where to start. Work the load up SLOWLY, check for signs of over-pressure and chronograph to verify the needed result. ETA: To answer the OP's question, don't worry about the vast difference in OAL unless you are loading to max velocities. You will see the variance due to using mixed brass. There is even a little bit of variance when using the same headstamp brass. For plinking purposes, I usually stay right around the starting load data. [/QUOTE]
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