Reg,
You state you're using spray on lube... I've done this also with bottlenecked pistol brass and the way I was taught to do it was to place the bass in a shoebox, spray 'em and lightly shake the box to spread the lube equally... just wondering if this might be the source of your trouble (dirt particles in the box perhaps?)
FWIW, when I load rifle cartridges other than the .223, I use Imperial Sizing die wax and lighly lube by hand.
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