Thread: bolt failure P14

Originally Posted by Woody

@mucko. Glad it was no worse mate. Couple of questions. Forgive me please if you have considered these points, which is probable.
Trim length of cases compared to chamber length; was there sufficient clearance?
Seating depth of ogive relative to lands? I.E. Avoid jam.
Hot primers?
Heavy walled brass?
Basic stuff, I know, and most likely you had those things already sorted. The other engineering issues are something I am not expert in so cant comment on those.
All the best for fast recovery.

case length was fine,
huge jump to the lands about 200 thou mag box restricted coal to around book value.
federal mag primers
norma brass, had some loose primer pockets, never had tight fitting cases never had one hard to close.
checked burn rate to confirm correct powder.
metal were recoil lugs broke were a different colour to the fracture through the gas port suggesting a out fatigue pattern.
if i did something wrong i havent found it yet.
i surmise that when the bolt let go the ass blew out of the case, i dont have much of the brass base left, i haven't found evidence through reloading diary and my systems that i overloaded or produced a round outside the specs of the adi manual, pressure would of been around 58,000psi and .8gr below max book load.

hope you and the boss are have a nice Christmas