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There is no saami spec on this case yet and there is more than one set of specs. I chambered my barrels with a Dave Manson 300-221 reamer and most cases will fit fine using the CH4D dies. I tried some dummy rounds loaded by a friend with redding dies and they did not fit. There may be a die problem or a chamber problem depending on who's reamer, dies and cases you are using. One other problem very commonly encountered is the thick neck due to heavier walled brass in military cases. I've found a few different types that must be neck turned just to fit the chamber. For the most part I've decided to use only winchester or Lake city brass from now on. Both have been pretty consistant and require no special treatment. What your problem may be is exactly the thick neck and putting a bullet into the case prevents the neck from "squishing" enough for the bolt to close. I've had some of these heavy walled necks that even after sizing they still won't fit the chamber when there is no bullet in them. I've never tried hammering the bolt home as I don't want to have to hammer it open. If it doesn't fit it doesn't fit.
Good luck
Frank
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