If you load range brass , inspect each one for brass with small pistol primers ( large pistol primers have been SOP for ever in .45 ACP ) .
On a LM , a brass with a SP primer will cause PROBLEMS , if you are set up for LP primers . I expect the same with all progressives ?
Sort any brass with SP primers into a batch . Load then as a batch , after you have changed the primer assembly to the one for SP primers .
As far as I know, all .45 ACP brass with small primers is marked "NT" on the head stamp. It stands for "Non Toxic"