Never had a cartridge not go off when doing this.
As HiBC said, spraying smaller batch sizes will allow your brass to lay on it's side and prevent a lot of lube going inside the brass.
...anything more then 200 would likely not sit flat if you're shaking and tossing them around .
Maybe try only filling the tub halfway or even a third. Spray, shake, dump them in another tub and do the next batch.No no I don’t spray when shaking them . Shake , spray , shake , spray then swirl with hand a few times as they dry . One reason I use the tub is not needing to handle the cases by hand . Meaning I have little interest on making sure they all lay flat . I never liked laying out my cases nice and uniform or lubing one at a time with the waxes . The more I can do in the least amount of time is my goal ;-)
Me somewhere on page 3 said:I toss the full batch into a plastic tub then spray a couple squirts , shake tub well and spray a couple more squirts then shake tub and swirl cases with gloved hand . When I shake the tub the heavier end of the cases naturally move to the bottom resulting in the case mouths pointing up . It's virtually impossible for me to NOT get case lube inside my cases . In fact I like it because the expander glides through so easy compared to not having the lube in there .