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Rifles, Reloading, Optics, Equipment
Reloading
Question on finding pressure
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<blockquote data-quote="baldhunter" data-source="post: 3038248" data-attributes="member: 11853"><p>I watched my velocity jump way up one day as I started seating my bullets closer to the lands.My load started around .050 off.Once I got inside .020 off the lands,the velocity increase was equal to adding about 1.0-1.5grs of powder.With velocity increase,there is also a pressure increase.Watching for pressure signs on the brass head stamps can vary a lot too.I ran into this with softer Norma brass.I started working up some loads for one of my rifles using Winchester and Remington brass.I bought some Norma brass and the loads were way over pressure for the Norma brass.I compared the case volumes of the three brass.The Norma had the largest volume,followed by Remington and the Winchester with the smallest volume.The Remington and Winchester had absolutely no pressure signs and primer pockets were tight even after four firings on some of the cases.With the same loads and bullets,the Norma brass showed ejector marks and the primer pockets stretched to the point that they were too loose to be used a second time.I had to back off my loads 1.0-1.5grs depending on the powder and all the pressure signs went away on the Norma brass.Without proper testing equipment,it's really hard to know just where your at with the pressure.So now I'm running my loads that are giving me good case life with the Norma brass and not what the Winchester and Reminton brass can handle.The This explains a lot about what's going on internally and is a good read.</p><p>[URL unfurl="true"]https://www.hornady.com/team-hornady/ballistic-calculators/ballistic-resources/internal-ballistics[/URL]</p></blockquote><p></p>
[QUOTE="baldhunter, post: 3038248, member: 11853"] I watched my velocity jump way up one day as I started seating my bullets closer to the lands.My load started around .050 off.Once I got inside .020 off the lands,the velocity increase was equal to adding about 1.0-1.5grs of powder.With velocity increase,there is also a pressure increase.Watching for pressure signs on the brass head stamps can vary a lot too.I ran into this with softer Norma brass.I started working up some loads for one of my rifles using Winchester and Remington brass.I bought some Norma brass and the loads were way over pressure for the Norma brass.I compared the case volumes of the three brass.The Norma had the largest volume,followed by Remington and the Winchester with the smallest volume.The Remington and Winchester had absolutely no pressure signs and primer pockets were tight even after four firings on some of the cases.With the same loads and bullets,the Norma brass showed ejector marks and the primer pockets stretched to the point that they were too loose to be used a second time.I had to back off my loads 1.0-1.5grs depending on the powder and all the pressure signs went away on the Norma brass.Without proper testing equipment,it's really hard to know just where your at with the pressure.So now I'm running my loads that are giving me good case life with the Norma brass and not what the Winchester and Reminton brass can handle.The This explains a lot about what's going on internally and is a good read. [URL unfurl="true"]https://www.hornady.com/team-hornady/ballistic-calculators/ballistic-resources/internal-ballistics[/URL] [/QUOTE]
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Question on finding pressure
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