this was in a Peterson .260 Rem case with the Palma style SR primer and the .055 flash hole. The pins are just the right length to lodge sideways in .264 neck also but I am used to finding one or two stuck there every 100 cases or so. I am surprised the primer did not blow the pin out of the flash hole and ignite the powder but it definitely fired and did not move the pin. I am sure anyone who uses the pins has probably fired a pin down the barrel without knowing so. There was one benchrester a year or so back on another forum that found one stuck in a patch when he was cleaning his rifle. It had to have gotten stuck in one of the grooves, he said the barrel kept shooting fine.
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