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Tennessee Gun Owners Forums
Reloading
Compressed loads question
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<blockquote data-quote="Hunter 257W" data-source="post: 5032880" data-attributes="member: 12277"><p>TennTrapper, when a loading manual quantifies a load as being over 100% case capacity, it is talking about the volume of powder being greater than the literal volume of the case , it has nothing do with the pressure. All the loads in a published manual will be within normal pressure limits. However due to variations in density the various powders will fill the case more or less full. The bulky slower burning ones may over fill it and be rated as 100%+ case capacity. I can't recall exactly where on the case that nominal capacity is measured but it is standardized at least for each cartridge. If it were to the base of a bullet, you'd still need to know which bullet seated to what over all length. You don't really need to know that detail to reload though. The main thing is that it's a good thing to choose a powder that is close to 100% capacity for less variation in powder position. For large case older cartridges that were designed for black powder it's good to use the bulkier powders to best avoid double charges. The 45 Colt is one of my favorites and that gapping powder chamber can look mighty empty with a light load of some of the faster "shotgun" powders. </p><p></p><p>The 460 Weatherby loads i mentioned above were listed in loading manuals and were listed as compressed loads. They were definitely not something I tried on my own but were approved pressure tested loads. They left little room at all and powder is way up the neck of the case.</p></blockquote><p></p>
[QUOTE="Hunter 257W, post: 5032880, member: 12277"] TennTrapper, when a loading manual quantifies a load as being over 100% case capacity, it is talking about the volume of powder being greater than the literal volume of the case , it has nothing do with the pressure. All the loads in a published manual will be within normal pressure limits. However due to variations in density the various powders will fill the case more or less full. The bulky slower burning ones may over fill it and be rated as 100%+ case capacity. I can't recall exactly where on the case that nominal capacity is measured but it is standardized at least for each cartridge. If it were to the base of a bullet, you'd still need to know which bullet seated to what over all length. You don't really need to know that detail to reload though. The main thing is that it's a good thing to choose a powder that is close to 100% capacity for less variation in powder position. For large case older cartridges that were designed for black powder it's good to use the bulkier powders to best avoid double charges. The 45 Colt is one of my favorites and that gapping powder chamber can look mighty empty with a light load of some of the faster "shotgun" powders. The 460 Weatherby loads i mentioned above were listed in loading manuals and were listed as compressed loads. They were definitely not something I tried on my own but were approved pressure tested loads. They left little room at all and powder is way up the neck of the case. [/QUOTE]
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Reloading
Compressed loads question
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