hey old ,get your problem figured out? years ago many rifles were converted in mainly south american countries to 308 or the nato round. trouble was barrels were made for the 7.65 round. this made them very inaccurate with common 308 dia bullets.so folks simply unscrewed the 308 expander,and replaced it with 311.mike the expander on your die.it will be the piece just above the decapping pin. what happens when you run a case in your die,decapper knocks out old primer,expander does not touch case on way in.as case enters die body it sizes it down to below proper size.expander plug sizes it to proper size when you remove case from die.WHY it happens this way is so INSIDE of case is correct size,outside of case neck may vary some depending on thickness of brass.changeing brass wont probably help you unless brass has been reduced in size in the neck for some reason. the only thing then that will cause this is if your prepping or outside neck turning your brass before it is resized. if you do this,die cannot push brass down far enough and expander plug wont even touch. start simply by micing your expander plug,bet youll find your problem there. by the way,,if this die came WITH your rifle,slug your barrel.its VERY VERY possible it has a 311/313 bore.literally thousands of them out there that do have. no problem with them,but many folks dont bother to slug their barrels if they have a 308 that wont shoot right.30 cal bullets have ranged over the years from .300 to just about any thing up to .315.most folks dont know that theres lots of 30 cal barrels out there that have a 307 bore also.301 is standard on many british 30 cal cartridges. supposed ly the 7.62 nato round standardized this.and is why many folks recommend you do NOT shoot nato rounds in a gun marked 308 winchester.shooting one of course in a rifle with a larger bore,is normally safe. but what would happen if you shot one in a old martini cadet rifle for instance that simply had a 308 reamer ran into it,with a 301 bore? probably the martini action could handle it,but maybe not also.the confusion about the 308,and the 7.62 nato has caused about as many problems as any other cartridge bar none.
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