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Message: <blockquote data-quote="swampratt" data-source="post: 2361638" data-attributes="member: 15054">It is actually interference fit deal i call it neck tension measured in  thousandths.The 8x57 i think has a .323" bullet diameter.When you measure the bearing surface of a  bullet after pulling one you will know what it is exactly.The neck ID on the brass needs to be a smaller diameter to create a seal and hold bullet secure.(as we know).0005" i feel is about the minimum for the neck ID being smaller than bullet OD.Sorry for any confusion..in my terminology.I measure with dial calipersI have measured interference fit and PSI to seat and pull bullets also.With annealed and non annealed multiple fired brass.Annealed brass takes more pressure to seat and pull the bullet at the same interference fit.When you get up to .0025" and more interference fit it takes more pressure to seat ,The 30-06 i tested took as much as 150psi to seat but only 80-100 to pull it.Now at .002" or under the seating pressure and pulling pressure were the same..001" to .0015" were around 45-65psi to seat and i did not test below that..That was with multiple fired brass...Once i annealed that brass that same .0015" took  80 psi to seat it....Acts like a tighter spring when annealed really resisting the forces that want to open it to bullet diameter.I bet your cases are annealed never fired..and with that in mind i would think there would be some interference fit left after bullet removal...check and see.. Have fun.</blockquote>

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