Thread: Pressure Trace
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Old February 10, 2018, 01:03 PM   #27
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 16,117
I've done both. The brass forward of the pressure ring is what expands to fill the chamber and it seems to spring back about 0.001"-0.002"; the larger number when the chamber is generous compared to the size of the case. The error varies with the size of the case, but it's about half a grain of water capacity in a .308 Winchester fired in a chamber 0.002" bigger than the case in length and diameter. In a tight match chamber the diameter will change less and a quarter of a grain becomes more likely.
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