Great point fellas.
Because shotgun powder is near impossible to get I had three different powder brands to reload three cases of shells. I would make sure I didn't load odd numbers (all in 25 round increments) so I had no loose rounds. I would empty the machine (Pacific 366) of all hulls and rounds prior to moving on to the next brand of powder. Each brand takes it's own specific powder bushing to get the desired fps charge of grains. I then marked each 25 round box with the powder brand and grains so there was never any confusion.
No alcohol is a must also and thank you for bringing that up Cinders.