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They are pics from the internet, hand primer tool jammed and set off a primer, the proximity detonation of all the other primers in the tool opens up the flesh, not good.

Treat primers with respect

Thats normal with some batches of Norma brass these days

Just lube the primer pocket with redding sizing lube on a cotton ear bud and the primers are far easier to seat to full depth.

Do not...

How much does your trim length vary/alter after firing ?

I only trim brass thats had at least one firing