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<Jn316> |
Gunboat, the primer sticking out a little bit is also another one of the very low pressure signs that a cartridge will display. The sequence of events when we pull the trigger on a round is: the firing pin hits the primer and shoves the case forward in the chamber as much as the headspace will allow. The primer then ignites the powder. The powder creates enough pressure that it expands the case to grip the case wall and at the same time slams the case back against the bolt thereby re-seating the primer. I think in your case the case did not slam back and re-seat the primer leaving it somewhat sticking out. | ||
<gunboat> |
Jn316, What you said seems to make sense. The other 5 rounds showed no sign of primer protrusion. So, case number 6 stuck "forward" as pressure built up, maybe because of a dirtier chamber or whatever. It ended up sealing better in the neck and shoulder so less gas escaped, higher max pressure, higher velocity.... Seems like I need to add a few more grains of IMR 4895. | ||
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