Hey guys! I'm not sure how to handle this one I just started using a .312 ex-pander plug from NOE in a lee universal ex-pander die to make room made for a .311 sized boolet. I was previously using the Lyman M die dimensions of witch are .307-.308. Cases are lake city 7.62X51 sized using a plus .004 shell holder. Anyhow now with the extra flare in the case neck the finished rounds wont case gauge anymore. I should also mention that after seating the boolet I use a lee factory crimp die.
My first thought is to try a dry case neck lubricant witch i'm not too excited about just another step/cost ect. Before when using the M die I did not use any kind of a inside case neck lubricant and everything seem to work out fine. Perhaps the most important/relevant piece of information is that these round are feeding the mighty M1A and so there is risk of slam fire if rounds do not chamber cleanly henceforth why i case gauge them. i realize that is a step that is not necessary for most.
Maby I'm all mixed up on this, and most guys are using some kind of inside case neck lubricant when aggressively neck flaring with oversized expanders like this?
thanks everybody in advance! Man i just really like to shoot!