DD,
Seriously, yours is the first time I've ever heard of someone having had an accident due to static electricity with BP. I knew a guy that did all sorts of tests trying to ignite BP by accident and he told me that in fact it was pretty difficult to ignite from normal static electricity. This wasn’t the only time I’d heard this.
In the older versions of the Buffalo Arms catalog Gullo states that he used a standard Lyman 55 powder measure for years without incident. While the operating principles might be a little different between the Lyman 55 and the RCBS, I think that both shear BP granules with equal abandon. It’s easy to get a brass tube that replaces the hopper on your RCBS uniflow if that’s your concern. I probably loaded about 2000 rounds on mine before going to the Lyman.
BTW, my RCBS has the micrometer stem, it’s cool, but no where near as cool as the Harrel’s
Chuck