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Old December 31, 2019, 05:02 PM   #210
Senior Member
Join Date: June 17, 2010
Location: Virginia
Posts: 5,958
... case failing to seal to the chamber and backing to
the bolt breech face before peak pressure is attained
Whether the neck expands/locks in forward section, or the case moves back against the bolt face early, or the case seals but stretches to meet the bolt face -- the shorter Starline web appears to be moving back/beyond the protective chamber wall and into the unsupported chamfer space.

Thin case wall so exposed cannot contain the high pressure.

Combining max-but-within tolerances ....
- Long chamfer zone,
- Long bolt face setback (headspace) distance
- Short web

.... voila.
mehavey is offline  
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