light primer striking problem

[browningautorifle]

on the 3 fired cases I can see a primer push back

If you're just firing live primed cases, that will happen. There's no chamber pressure to flatten them out. Try a factory new case and prime them to test. You must have a couple factory new cartridges around?

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[floydthecat]

If you're just firing live primed cases, that will happen. There's no chamber pressure to flatten them out. Try a factory new case and prime them to test. You must have a couple factory new cartridges around?

Agreed. If primers back-out on fired live rounds, that might be another indication of long head space.

[donki1967]

Jim
The rounds that I fired were live, loaded with 12.2 grains of VITHAVUORI N110 powder.
Nothing wrong with this load, very good cycling.