On average how much extractor should be showing when you measure the diameter of the bolt face then measure to the extractor. More than .017"?? I'm having a problem with a 300 RUM not extracting about 5% of the time. I've measured the cases and have not seen any noticeable difference from ones that eject and ones that don't. Bolt face = .542" To the extractor = .525" Any help would be greatly appreciated.