All loading companies making these have the same disclaimer, a true Black Powder dispensing unit has brass components.
As mentioned above you may have problems with static cling of BP internally using the measure.
First thing is to use soap and water to wash the plastic parts well and then Wipe it down every once in awhile with a dryer sheet.
The issue at hand;
Static discharge will not set powder off directly, but with the powder drop scales fine particulate can accumulate and as the powder drops it mixes with air,,
It's the powder/air mix that can be volatile. Thus the disclaimer.
Any fine particulate/dust mixed with the proper volume of air can be voltile, Saw dust in cabnit shops,, Seed dust in grain mills