In my own experience (and I have had the no powder woops much as I don't like to admit it) depending upon neck tension, the projectile will range from no movement to just engaging the rifling in which case a gentle tap with a rod will dislodge it. Sound like maybe primers not seated correctly but if that was the case and they were proud you probably would have felt a wee bit of resistance closing the bolt. Oil contamination - some manufacturers claim their primers are impervious as they are sealed with a lacquer. I have certainly used oil to kill primers but have also had them still give a pop 24 hours later when fired. Whether strong enough to ignite a powder charge...?? I have experienced one misfire ever and that was with a CCI BR primer behind win 760 powder which is a little hard to light up at any rate. Pulled the cartridge apart and the powder in the bottom had turned slightly yellow and melted so some sort of flame had got to it. Just put it down to a bad primer. (No, my loads are not awash with lube!)
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