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Rifles, Reloading, Optics, Equipment
Reloading
Carbon on the outside of the case neck after firing?
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<blockquote data-quote="Bullet bumper" data-source="post: 853969" data-attributes="member: 17844"><p>Most chambers have about .015 more room for the neck length than the length of a new case anyway. You can't get a much shorter neck than a .223 Rem and I don't get any carbon on my necks . </p><p>Just because the total pressure shown on the primers and felt on the bolt lift is up there does not mean the pressure curve was quick enough to get the case neck sealed before the powder really starts to burn to full pressure further down the barrel . </p><p>With slow burning powders the bullet is pushed into the start of the bore by a column of unburnt powder and at that point the pressure may be low and not enough to seal a hard case neck . A microsecond later the full pressure develops but some carbon gases may have already infiltrated through the unburnt powder grains and slipped past the neck , a microsecond later it seals. </p><p>Try working up a load for Varget it's faster and see if that helps . </p><p>I have noticed a pattern of Americans using slower powders than is best in lots of cartridges. Our powder manufacture ADI dropped one of our best powders for 223 in favour of a slower powder that suited the Hogdon USA market and it was not the best powder at all . I think it's encouraged by the US firearms industry as a safety measure because it's harder to overload with slow for the cartridge powders and it's starting here also .</p></blockquote><p></p>
[QUOTE="Bullet bumper, post: 853969, member: 17844"] Most chambers have about .015 more room for the neck length than the length of a new case anyway. You can't get a much shorter neck than a .223 Rem and I don't get any carbon on my necks . Just because the total pressure shown on the primers and felt on the bolt lift is up there does not mean the pressure curve was quick enough to get the case neck sealed before the powder really starts to burn to full pressure further down the barrel . With slow burning powders the bullet is pushed into the start of the bore by a column of unburnt powder and at that point the pressure may be low and not enough to seal a hard case neck . A microsecond later the full pressure develops but some carbon gases may have already infiltrated through the unburnt powder grains and slipped past the neck , a microsecond later it seals. Try working up a load for Varget it's faster and see if that helps . I have noticed a pattern of Americans using slower powders than is best in lots of cartridges. Our powder manufacture ADI dropped one of our best powders for 223 in favour of a slower powder that suited the Hogdon USA market and it was not the best powder at all . I think it's encouraged by the US firearms industry as a safety measure because it's harder to overload with slow for the cartridge powders and it's starting here also . [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Carbon on the outside of the case neck after firing?
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