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Rifles, Reloading, Optics, Equipment
Reloading
Whats the story on flat primers?
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<blockquote data-quote="MagnumManiac" data-source="post: 982819" data-attributes="member: 10755"><p>Wasn't inferring that you are stupid, inexperience does not imply to me stupidity, I apologise if that is how you took it.</p><p>Primer appearance is not a good indicator of excessive pressure because different brands behave differently at differing pressures.</p><p>The best 2 indicators of excessive pressures are brass case appearance, firstly the expansion line location. If you compare a start load fired case to a max load fired case, you will notice that the expansion line is CLOSER to the web of the case due to more pressure, if comparing the same lot of brass. Secondly, ejector/extractor marks will show up pressures are excessive regardless of whether the primers are flat or not. Embossing of the head of the case with machining marks off the bolt face can indicate excessive pressure if a lower load did not have them appear, but it may just be that the machining marks are quite deep too.</p><p>The rifle will also tell you that pressures are excessive if you have stiff bolt lift accompanied by other marks on the brass, but also sticky extraction is a sure sign of excessive pressure if you know the chamber was clean and dry before firing that shot, oil in the chamber will cause sticky bolt lift and sticky extraction, it may also leave ejector/extractor marks due to excess bolt thrust.</p><p>The brass case tells you far more than primer appearance.</p><p></p><p>Hope this helps.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 982819, member: 10755"] Wasn't inferring that you are stupid, inexperience does not imply to me stupidity, I apologise if that is how you took it. Primer appearance is not a good indicator of excessive pressure because different brands behave differently at differing pressures. The best 2 indicators of excessive pressures are brass case appearance, firstly the expansion line location. If you compare a start load fired case to a max load fired case, you will notice that the expansion line is CLOSER to the web of the case due to more pressure, if comparing the same lot of brass. Secondly, ejector/extractor marks will show up pressures are excessive regardless of whether the primers are flat or not. Embossing of the head of the case with machining marks off the bolt face can indicate excessive pressure if a lower load did not have them appear, but it may just be that the machining marks are quite deep too. The rifle will also tell you that pressures are excessive if you have stiff bolt lift accompanied by other marks on the brass, but also sticky extraction is a sure sign of excessive pressure if you know the chamber was clean and dry before firing that shot, oil in the chamber will cause sticky bolt lift and sticky extraction, it may also leave ejector/extractor marks due to excess bolt thrust. The brass case tells you far more than primer appearance. Hope this helps. Cheers. gun) [/QUOTE]
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Reloading
Whats the story on flat primers?
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