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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="Mikecr" data-source="post: 854134" data-attributes="member: 1521"><p>I strive for low ES in my reloading plan.</p><p>With this there are a few adjustments from common:</p><p>-Fastest appropriate powder -that fills a case</p><p>-Best performing primer and best primer striking</p><p>-Long enough barrel for powder burn</p><p>-Matched reloaded case H20 capacities</p><p>-Smallest neck clearances practical</p><p>-Tightest chamber end to trim clearance practical</p><p>-Consistent neck tension</p><p></p><p>With testing in the past I could call a hit to ES with a look at neck sooting, before checking the chrono. And I eventually managed it with more consideration of clearances left with trim length.</p><p>Less chamber end clearance meant less sooting, meant less ES with my cartridges & loads.</p><p>This was an easy adjustment for me because 'matched reloaded case H20 capacities' took me away from FL sizing, which took me away from chasing trim lengths anyway.</p><p>I started setting the fireformed chamber end clearance as close as I could, while not under 5thou, and a little bit of trimmed neck length variance from this(~5thou) did not matter to ES.</p><p></p><p>Being this close I still look as a habit for any shine to mouths on ejection. This is a sign I'm getting carbon buildup from chamber end(time to clean), or the brass has stretched to chamber end(which is dangerous).</p><p>Now & then I see the carbon sign, but I haven't had to actually re-trim necks yet.</p><p></p><p>It's just one factor, but no matter the cartridge or load, I wouldn't act on generalizations about it.</p><p>It's like most anything, you should do as well as practical with it.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 854134, member: 1521"] I strive for low ES in my reloading plan. With this there are a few adjustments from common: -Fastest appropriate powder -that fills a case -Best performing primer and best primer striking -Long enough barrel for powder burn -Matched reloaded case H20 capacities -Smallest neck clearances practical -Tightest chamber end to trim clearance practical -Consistent neck tension With testing in the past I could call a hit to ES with a look at neck sooting, before checking the chrono. And I eventually managed it with more consideration of clearances left with trim length. Less chamber end clearance meant less sooting, meant less ES with my cartridges & loads. This was an easy adjustment for me because 'matched reloaded case H20 capacities' took me away from FL sizing, which took me away from chasing trim lengths anyway. I started setting the fireformed chamber end clearance as close as I could, while not under 5thou, and a little bit of trimmed neck length variance from this(~5thou) did not matter to ES. Being this close I still look as a habit for any shine to mouths on ejection. This is a sign I'm getting carbon buildup from chamber end(time to clean), or the brass has stretched to chamber end(which is dangerous). Now & then I see the carbon sign, but I haven't had to actually re-trim necks yet. It's just one factor, but no matter the cartridge or load, I wouldn't act on generalizations about it. It's like most anything, you should do as well as practical with it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Carbon on the outside of the case neck after firing?
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