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Are you honestly trying to assert that some experience case neck splits (I'm talking regular basis) and some don't on the basis of of pure luck?
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It is pretty much luck how well any individual die matches any individual chamber unless they are cut with the same reamer very close together in the reamers life.
A factory starts with e new reamer at the larger end of allowable tolerance, ad uses it until it wears to the small end.
The die makers do the same thing.
How any chamber and any die mach up is a crap shoot within the allowable tolerances.