I am loading on a Dillon 550b cast 356402's sized 356 w/ Magma Lube w/ 4.3 gr 231 in mixed 9mm brass (all commercial - no processed military). Many of the loaded rounds will slide into and out of a Dillon Guage and function flawlessly in all my sub machineguns and pistols.
HOWEVER, after loading, some of them DO NOT guage correctly and will not go all the way down into the guage. They are ever so slightly oversized apparently.
I don't know what is causing this. Same bullet, same sizer die, same eveything except the brass.
Could it be that I need to sort my brass by brand? Could it be that the bullet, when seated, "fattens" the overall outside diameter of the brass because the brass is thicker?
Most of them don't seem to be a problem in full auto in the MAC and the S&W 76, (they have generous chambers) but the UZI doesn't particularly like them nor do the pistols.
If it IS the brass, how can I save hundreds of loaded rounds?....WITHOUT disassembling them for components?
HELP!