9mm priming follies Part 2

[m657]

Starting new thread to Avoid Confusion if possible;

Prelude: previous decap pin left intact as previous loading travails had ample discussion of possible remedies; no such changes at this study, in order to control given variables of case condition specifics.

New observed findings:

1-50 round group sorted used 9mm casings from my archives, into 'dull brass color' primers (assumed to be WSP) with NO 'crimped pocket' sign';

1-35 round group sorted 'shiny nickle color' without crimped pocket;

1-35 round group sorted 'shiny nickel color' but with the obvious extra crimped pocket sign;

All cases had random distribution of both Glock-style straight-bar firing pin, and round-indent firing pin. Did not count/sort these as seemed inconsequential for this report.

Findings
Loaded on Dillon 650 press recently refurbished & adjusted by major factory overhaul;

of 50 loaded cases Group 1; 44 were perfect & ready for the firing line; 4 were un-reprimed, remaining non-decapped 'shiny case intruders' of the Group 3 variety WITH error of Primer Resuck Syndrome, while 2 primers were awkward partially inserted out of spec, also Group 3 casings; Failure to eject primer in ZERO % of cases tested.

of 35 cases loaded in Group 2, non-crimped pockets, there were 6 with old primer remaining in the PRS described above; fail to eject primer in 18%;

of 35 Group 3 shiny-primer in crimped pocket sign, 13 were fail-to-eject primer normally, vividly demonstrating PRS in a full 33% of cases.

CONCLUSION
while sample numbers are small, my current working conclusion is now: the cause is MORE LIKELY the 'crimped primer pocket' producing abnormal decapping process.

Comment/discussion solicited.
Note: all 'shiny' refers to PRIMER color, not case color; all cases were various brass color tones;