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The Range
Ammo & Reloading
Blog on 9mm short chamber bullets.
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<blockquote data-quote="Mad Professor" data-source="post: 3575387" data-attributes="member: 5316"><p>The only Glocks I seen it with Gen 5 9mm. The only defensive rounds I have personally seen with issues have been 147g and I don’t remember the brand. I have tested about 10 of my Gen 5s with 147g HST and Lawman and none of them hit the lands. I have seen it more at matches with all kinds of reloads. Almost always, the symptom is the shooter cannot clear the gun at the end of the stage. The bullet is stuck in the lands preventing the barrel from unlocking and allowing the slide to move back.</p><p></p><p>Bullets with a larger ogive toward the tip (and/or loaded longer) are the usual culprit. Heavier bullets are usually that way and a hollow point version will generally do that. </p><p></p><p>CZs are far worse and it has been a known issue for many years. It shows up in even in some 115g loads. </p><p></p><p>The throat is lengthened slightly with a throating reamer to stop it. I have cut them just past the point of the load engaging the lands. </p><p></p><p>The reamer to do this is custom built out of carbide and expensive. High speed steel won’t get it on the CZs. I’m not sure on the Glocks, as I’ve only done one. </p><p></p><p></p><p>So far, the only gun of mine I have had to cut was a CZ Shadow 2.</p></blockquote><p></p>
[QUOTE="Mad Professor, post: 3575387, member: 5316"] The only Glocks I seen it with Gen 5 9mm. The only defensive rounds I have personally seen with issues have been 147g and I don’t remember the brand. I have tested about 10 of my Gen 5s with 147g HST and Lawman and none of them hit the lands. I have seen it more at matches with all kinds of reloads. Almost always, the symptom is the shooter cannot clear the gun at the end of the stage. The bullet is stuck in the lands preventing the barrel from unlocking and allowing the slide to move back. Bullets with a larger ogive toward the tip (and/or loaded longer) are the usual culprit. Heavier bullets are usually that way and a hollow point version will generally do that. CZs are far worse and it has been a known issue for many years. It shows up in even in some 115g loads. The throat is lengthened slightly with a throating reamer to stop it. I have cut them just past the point of the load engaging the lands. The reamer to do this is custom built out of carbide and expensive. High speed steel won’t get it on the CZs. I’m not sure on the Glocks, as I’ve only done one. So far, the only gun of mine I have had to cut was a CZ Shadow 2. [/QUOTE]
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