Ok, Im not saying I am a full pro but I have been doing this for over 20 years and never had this problem before.
Im loading some 45 ACP for my M-10 NFA rig. I have loaded roughly 3k of various FMJ and plated 230 with no problem at all.
I use a cage gauge (Dillon Gauge) and I get maybe 2or 3 out of 100 that wont go in. So I toss them into the pull down section.
I start up loading some (Nevada, west coast, extreme, or whatever they are calling themselves now) 230 LRN. I adjust the OAL, clean out the dies and inspect then clean my whole 650 then get to town on the load I have worked up before with these. As Im gauging the first 100 that come out I have a pile of 23 that fail to go in fully.
I clean the gauge then proceed to crank out 100 more to see if I am just feeling strange after the bottle of wine the wife and I shared the evening before. this time I hit 37 that wont go in. All are various makes of brass and loaded to correct OAL.
I check the OD and it seems to be spot on 452. WTF is going on?
I have loaded many 100,000s of various 45 acp in the past and never had this problem.
Are maybe the bullets out of round causing this. OF course I dont have my handy dandy concentricty tool anymore.
Im at a loss.
that being said I loaded up a mag of the "bad" ones just for shits and giggles and dumped them through the mac and they ran fine.
I know stupid but I couldnt figure out what the hell is happening.