You didn't read the OP or the thread. Cartridge fits into the case gauge after sizing but will not fit into case gauge after loading. It does chamber in the rifle fine.Ok, so you said the brass will chamber prior to loading, is it fully chambered? Check the brass once you chamber and eject it! Is there any chamber marks on the brass? If not you have ruled out the brass! Now try loading a couple .10 shorter, will it chamber? If yes your throat may not be long enough for you current load or check the bullet it’s self! May be the bullets a thou to big, wouldn’t be the first time!