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Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs way below max load
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<blockquote data-quote="freddiej" data-source="post: 1695219" data-attributes="member: 26227"><p>I have something to add to this. not one person brought this up that I have seen so I am going to. You had a gunsmith perform this barrel install. this means he did it the way I would do it, I am also a gunsmith, he probably used a reamer service that keeps reamers sharp and sharpened after about every 4th yo 6th use. this can make for a truly minimum or maybe a 0.001" under minimum chamber. this means you have a "tight" chamber. this is very good for stretching being at a minimum and other such great thing. this also means you have a closely headspaced chamber. this detracts from the area in which the case expands (minimal stretching of the case). this means your pressures are higher to start with. If you show pressure signs at a certain powder charge; consider that your danger zone and back off 1 full grain to be your maximum powder charge. This should keep you from seeing pressure signs. this is if your powder scale is not off by a certain percentage. I have three rifles like this in my own collection. all were built by me in gunsmithing college. I used 4D reamer service. all shoot very well and they save brass. an easy test is to take a fired case, measure it at the datum lines of your drawings in your reloading manuals. average is 0.003"-0.005" larger than the drawing dimensions say. if your measurements are 0.000" to 0.002" then you have a SAAMI min spec chamber and your loading data should be down loaded 1 to 2 grains depending on case volume.</p></blockquote><p></p>
[QUOTE="freddiej, post: 1695219, member: 26227"] I have something to add to this. not one person brought this up that I have seen so I am going to. You had a gunsmith perform this barrel install. this means he did it the way I would do it, I am also a gunsmith, he probably used a reamer service that keeps reamers sharp and sharpened after about every 4th yo 6th use. this can make for a truly minimum or maybe a 0.001" under minimum chamber. this means you have a "tight" chamber. this is very good for stretching being at a minimum and other such great thing. this also means you have a closely headspaced chamber. this detracts from the area in which the case expands (minimal stretching of the case). this means your pressures are higher to start with. If you show pressure signs at a certain powder charge; consider that your danger zone and back off 1 full grain to be your maximum powder charge. This should keep you from seeing pressure signs. this is if your powder scale is not off by a certain percentage. I have three rifles like this in my own collection. all were built by me in gunsmithing college. I used 4D reamer service. all shoot very well and they save brass. an easy test is to take a fired case, measure it at the datum lines of your drawings in your reloading manuals. average is 0.003"-0.005" larger than the drawing dimensions say. if your measurements are 0.000" to 0.002" then you have a SAAMI min spec chamber and your loading data should be down loaded 1 to 2 grains depending on case volume. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs way below max load
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