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Tennessee Gun Owners Forums
Reloading
Compressed loads question
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<blockquote data-quote="DaveB" data-source="post: 5031618" data-attributes="member: 5958"><p>103% applies to the SAAMI specs only. SAAMI determines how much pressure the ignited charge will generate (in a proof barrel) and modified that number down to achieve safety in a typical production rifle. The ammo/powder manufacturers backfill the powder charge numbers to achieve the desired result (accuracy with no pressure signs). For example: I can put 25 gr of H335 in a 223 case and have plenty of room. But if I fill the case to 103% using H335 I have created a disaster. Pressure would far exceed SAAMI numbers. </p><p></p><p>If you load long the case capacity is increased (past the SAAMI spec) <strong>BUT</strong> you would STILL BE 103% just not compressed as much or at all. </p><p></p><p>And nothing wrong with that. When in doubt, check multiple sources. If still in doubt, work up to 103 looking for pressure signs. Just because powder X can be loaded to 103% of SAAMI case capacity DOES NOT mean another powder for the same cartridge can be loaded to 103%. </p><p></p><p>Compressed loads indicate a powder charge that exceeds SAAMI specs and in some rifles may not be safe. And if the compressed charge is borderline safe and someone throws an overcharge of a few grains, disaster could result in a modern rifle. </p><p></p><p>This is exactly why I own a forester collet bullet puller and a collet for every caliber. I have zero qualms about pulling as many as 100 rounds when I have found an error.</p></blockquote><p></p>
[QUOTE="DaveB, post: 5031618, member: 5958"] 103% applies to the SAAMI specs only. SAAMI determines how much pressure the ignited charge will generate (in a proof barrel) and modified that number down to achieve safety in a typical production rifle. The ammo/powder manufacturers backfill the powder charge numbers to achieve the desired result (accuracy with no pressure signs). For example: I can put 25 gr of H335 in a 223 case and have plenty of room. But if I fill the case to 103% using H335 I have created a disaster. Pressure would far exceed SAAMI numbers. If you load long the case capacity is increased (past the SAAMI spec) [B]BUT[/B] you would STILL BE 103% just not compressed as much or at all. And nothing wrong with that. When in doubt, check multiple sources. If still in doubt, work up to 103 looking for pressure signs. Just because powder X can be loaded to 103% of SAAMI case capacity DOES NOT mean another powder for the same cartridge can be loaded to 103%. Compressed loads indicate a powder charge that exceeds SAAMI specs and in some rifles may not be safe. And if the compressed charge is borderline safe and someone throws an overcharge of a few grains, disaster could result in a modern rifle. This is exactly why I own a forester collet bullet puller and a collet for every caliber. I have zero qualms about pulling as many as 100 rounds when I have found an error. [/QUOTE]
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Tennessee Gun Owners Forums
Reloading
Compressed loads question
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