For starters the cases should have been separated by headstamp, since you have no idea how many times the cases have been loaded you have to assume there is a spring back problem with the cases that won't chamber after sizing. If it were me I would probably discard all the cases and purchase 2 or more hundred cases (New/Virgin) and start over. Keep the cases in lots as you start to shoot them and know how many times they have been fired. I normally will not load a case more than four times, usually at this point the primer pockets are starting to loosen up, I do not want to load a case to the point the primer pocket starts to leak and etch the bolt face. I would think there is nothing wrong with the sizing die, further if you have access to a up to date reloading manual it might be a good idea to do some reading. William
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