black powder in a plastic powder measure

[Gabriel Law]

Does anyone have any reliable information about an incident where black powder blew up in a plastic powder measure?

I didn't think so.

Black Powder is transported all around the globe in plastic cans.  There is documentation that static electricity cannot ignite black powder.
So I conducted a little experiment and used myself and my equipment as the guinea pig...I loaded 250 rounds of 44-40 ammo with 3Fg GOEX black powder - without incident.

The RH in my shop is 7.5%...temperature 65 F.  The press is a Dillon 650.

This is an anecdote, not a recommendation.  One must take responsibility for their own actions.