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Rifles, Reloading, Optics, Equipment
Reloading
Black soot on cases head scratcher for me???
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<blockquote data-quote="Dirtrax" data-source="post: 2097084" data-attributes="member: 78945"><p>Sounds like a headspace problem to me. Let me explain why...</p><p>Same reamer, same barrel, but .030" greater CBTO. There are only a few options here.</p><p>You say that you size to -.002" but how do you know or measure this? I assume your benchmark is from reamer prints or experience with the two previous chambers. When fireforming cases it takes up to 3 firings of a case to approach "actual" dimensions +/- setback or rebound of the shoulder (datum line). If you continue to anneal it takes longer. A set of go/no-go gauges could lead you to an answer. You may be FF'ing to a greater headspace, essentially mimicking a wildcat chamber. </p><p>It's not at all uncommon for FF loads to shoot with excellent accuracy. Being able to add powder in this process is accounted for by the cushion of the brass expansion.</p></blockquote><p></p>
[QUOTE="Dirtrax, post: 2097084, member: 78945"] Sounds like a headspace problem to me. Let me explain why... Same reamer, same barrel, but .030” greater CBTO. There are only a few options here. You say that you size to -.002” but how do you know or measure this? I assume your benchmark is from reamer prints or experience with the two previous chambers. When fireforming cases it takes up to 3 firings of a case to approach “actual” dimensions +/- setback or rebound of the shoulder (datum line). If you continue to anneal it takes longer. A set of go/no-go gauges could lead you to an answer. You may be FF’ing to a greater headspace, essentially mimicking a wildcat chamber. It’s not at all uncommon for FF loads to shoot with excellent accuracy. Being able to add powder in this process is accounted for by the cushion of the brass expansion. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Black soot on cases head scratcher for me???
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