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The Basics, Starting Out
Semi auto advice needed
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<blockquote data-quote="Zen Archery" data-source="post: 2699714" data-attributes="member: 60545"><p>Sounds like my old Varget load which has more than enough pressure to cycle an AR, maybe too much gas for his AR.</p><p></p><p>I'd try 2 things</p><p>A). Develop a load 1 and 2gr under and see if it cycles. Hot loads can seal a case to the throat causing FTC (Fail to cycle) issues. [Trust me as one whose shot a 17cal out to 5060 FPS]. </p><p></p><p>B). Break down a factory load bullet pre-shot and post shot and grab all the measurements and compare it to your load development. Paying really close attention to case and shoulder length. Small caliber AR's running hot loads (refer to above) can be finicky with case length and shoulder jump.</p><p>Grab post shot case info to see how much jump factory load is allowing for case and shoulder length.</p><p>Reverse engineer case specs and start from there. </p><p></p><p>if factory load is cycling my spidy senses is guessing your case length is touching or slightly feeding into the throat. When launching a tiny bullet with that much heat it's temporarily sealing the case to the throat causing fail to cycle.</p><p></p><p>Good luck, keep us posted.</p></blockquote><p></p>
[QUOTE="Zen Archery, post: 2699714, member: 60545"] Sounds like my old Varget load which has more than enough pressure to cycle an AR, maybe too much gas for his AR. I’d try 2 things A). Develop a load 1 and 2gr under and see if it cycles. Hot loads can seal a case to the throat causing FTC (Fail to cycle) issues. [Trust me as one whose shot a 17cal out to 5060 FPS]. B). Break down a factory load bullet pre-shot and post shot and grab all the measurements and compare it to your load development. Paying really close attention to case and shoulder length. Small caliber AR’s running hot loads (refer to above) can be finicky with case length and shoulder jump. Grab post shot case info to see how much jump factory load is allowing for case and shoulder length. Reverse engineer case specs and start from there. if factory load is cycling my spidy senses is guessing your case length is touching or slightly feeding into the throat. When launching a tiny bullet with that much heat it’s temporarily sealing the case to the throat causing fail to cycle. Good luck, keep us posted. [/QUOTE]
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The Basics, Starting Out
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