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The Basics, Starting Out
Chronograph necessary?
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<blockquote data-quote="ATH" data-source="post: 1264304" data-attributes="member: 1656"><p>Velocity is not free. It costs pressure. I have been in multiple situations where the chronograph warned me I was at pressures the brass was not obviously showing.</p><p></p><p>Today I was doing load development for a precision AR I just built. Due to both time and temperatures, I elected not to go to the effort of setting up my chronograph until a later session. I fired a range of loads within the min/max on the Hodgdon website. I had an accuracy node on the lower end, and everything else was unacceptable. But it appeared I was approaching another node on the upper end. So I loaded a couple more sets, with the highest being 0.1gr over the Hodgdon listed max. Upon firing them, 3 of the 5 cases at that highest load came close to head separation. The load 0.2gr lighter had not showed clear signs on the cases that I was that close to issues. None of the primers were cratered or flattened.</p><p></p><p>If I had had the chrono set up, I'd bet $100 I would have looked at it, seen how high I was, and known to pull the bullets on the highest load.</p></blockquote><p></p>
[QUOTE="ATH, post: 1264304, member: 1656"] Velocity is not free. It costs pressure. I have been in multiple situations where the chronograph warned me I was at pressures the brass was not obviously showing. Today I was doing load development for a precision AR I just built. Due to both time and temperatures, I elected not to go to the effort of setting up my chronograph until a later session. I fired a range of loads within the min/max on the Hodgdon website. I had an accuracy node on the lower end, and everything else was unacceptable. But it appeared I was approaching another node on the upper end. So I loaded a couple more sets, with the highest being 0.1gr over the Hodgdon listed max. Upon firing them, 3 of the 5 cases at that highest load came close to head separation. The load 0.2gr lighter had not showed clear signs on the cases that I was that close to issues. None of the primers were cratered or flattened. If I had had the chrono set up, I'd bet $100 I would have looked at it, seen how high I was, and known to pull the bullets on the highest load. [/QUOTE]
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The Basics, Starting Out
Chronograph necessary?
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