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Rifles, Reloading, Optics, Equipment
Reloading
plastic flow of primer material
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<blockquote data-quote="Noobie" data-source="post: 2978983" data-attributes="member: 127485"><p>I've tried measuring brass near the case head. I also measure the chamber. New brass vs. once fired/neck sized will be different, after that it didn't change much. Various brands of brass will make a huge difference in 'pressure signs', and no doubt some become dangerous to load with much lower charges. Primers, type and brand, definitely will make a big difference in pressure signs with all other variables kept constant. Manufacturers test loads in special pressure barrels which have different chamber dimensions than most hunting barrels. They also use two different means to measure pressure, one being a copper crush - and these give very different results. </p><p>The bottom line is that there really is no way to tell what the pressure of a handload is in a rifle without some kind of instrumentation on it, and a load not exhibiting 'signs of pressure' may or may not be safe, and may be safe in some modern firearms but not others. Thus there really is no way for the handloader to determine if a load is 'safe'. Be conservative, or if you really need the extra few fps, buy a bigger rifle...</p><p>Finally there is the issue of 'the most accurate powder tested' posted in some data, and the 'ladder test' many handloaders use. Browning patented the BOSS system which actually tunes the vibration of the barrel to a given load, such that it is at full swing (like on a swingset) and thus doesn't change position (aim point) much with slight changes in velocity. I'm guessing the ladder and or the powder combo for 'most accurate' are two ways to achieve the same 'full swing' point in a given rifle. </p><p>These are just my opinions/experiences, not to be relied upon for your own safety.</p></blockquote><p></p>
[QUOTE="Noobie, post: 2978983, member: 127485"] I've tried measuring brass near the case head. I also measure the chamber. New brass vs. once fired/neck sized will be different, after that it didn't change much. Various brands of brass will make a huge difference in 'pressure signs', and no doubt some become dangerous to load with much lower charges. Primers, type and brand, definitely will make a big difference in pressure signs with all other variables kept constant. Manufacturers test loads in special pressure barrels which have different chamber dimensions than most hunting barrels. They also use two different means to measure pressure, one being a copper crush - and these give very different results. The bottom line is that there really is no way to tell what the pressure of a handload is in a rifle without some kind of instrumentation on it, and a load not exhibiting 'signs of pressure' may or may not be safe, and may be safe in some modern firearms but not others. Thus there really is no way for the handloader to determine if a load is 'safe'. Be conservative, or if you really need the extra few fps, buy a bigger rifle... Finally there is the issue of 'the most accurate powder tested' posted in some data, and the 'ladder test' many handloaders use. Browning patented the BOSS system which actually tunes the vibration of the barrel to a given load, such that it is at full swing (like on a swingset) and thus doesn't change position (aim point) much with slight changes in velocity. I'm guessing the ladder and or the powder combo for 'most accurate' are two ways to achieve the same 'full swing' point in a given rifle. These are just my opinions/experiences, not to be relied upon for your own safety. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
plastic flow of primer material
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