Using 9mm RCBS dies in my 550B Dillon unit, I'm having a problem with maintaining correct OAL. Loading Extreme 115 gr HP plated bullets to 1.130 ", the 1st couple will be OK then start varying by .003 - .010". Same thing happens after reset the seater die. I'm also using a Lee factory crimp die in station 4 but I don't think that would have any affect on the length. Just wondering cause I also load for 38 super, 38 special and .357, and .454 with no problem. Anyone out there experience this problem. Could it be I'm expecting to much, just a 74 yr old nitpicker.
thanks for any help...captn-tin Same headstamp in batches.