Extracted this from a MPR in 6.5PRC, bolt wasn’t noticeably hard to operate… I am really scratching my head with it.
What do you make of this??
- Thread starter David Lepley
- Start date
What was the load? Judging by the very sooty neck, im guessing it was very soft, and didn't seal the chamber.
is it ed related ? does the fix come in a discreet package ? abstract art of some sort ? an example of the forth stage of Peyronie's Disease?
Shoulder collapse due to low pressure load. Leaked gas before the case could expand and seal. There were lots of photos of this occurring in high capacity cases in the old Speer reloading manuals.
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That is the universal call sign for ... " Hey ! , Anneal your Brass" .
Your Brass has been Fired to many time and is hard . Pressure moved down the Neck over Shoulder and dented it, and you should have Annealed it a couple firings ago.
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The brass was annealed after every firing with an induction annealer, load was 67.0Gr of US 869 pushing a 140gr Nosler RDF, Lapua brass.
Dont know then ? . looks like just a bad piece of brass . Throw it in the trashcan and move on.
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This is typically a low pressure indication as noted above. You didn't say what powder/bullet so being compressed may or may not indicate the load is sufficient to seal the chamber. Excessive headspace and/or insufficient neck tension can also be a factor. The root cause is low pressure not expanding the neck to seal the chamber.
Thanks everyone, this all makes sense. The deformation of the case appeared like a vacuum had occurred internally, but it was high pressure on the outside due to poor sealing/slow pressurization.
