Had one or two loud (either over loaded or detonations) in every 50 rds. or so. Bullert is Lee 356 120 gr. TC over 4.2 gr. O.L. is 1.492 Acc. #2 in 38 spec cases.O.L. is alittle long because of short light bullet and TC style. Could the powder be bridging in my Lyman 55 measure while I am using the top slide adjustment only?? Or while cleaning drop tube, slides and inside of measure I reassembled lubing with motor mica and noticed excessive end play on whole drum assembly. Is there a washer or something used to take up the wear factor. The powder charges when weighed always seem to be within .10 th of gr. However when charging 50 cases unless pressure is kept on handle pushing it to the right I could also see the powder charge not being the same. Any one have any ideas. I have around 500 plus loaded rounds to break down too. afish4570