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Old December 31, 2019, 05:41 PM   #211
stagpanther
Senior Member
 
Join Date: March 2, 2014
Posts: 8,899
Quote:
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.
That's pretty much the conclusion I came to already, the real question is how to time the cartridge just right so that it has enough pressure quick enough to seal to the chamber and not move back, there's a heck of a lot of tolerance slack involved between the headspace and case lengths. Even if the case support problem goes away, inconsistency in timing will yield inconsistency in performance/accuracy.
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