Not wanting to get into a pissing contest where I have limited experience, I do know that when using a powder dispenser for BP, a special, non-sparking dispenser is highly recommended that is quite different from an iron/steel one that can be used for smokeless powder. It is similar to non-sparking crimping tools (zinc maybe) that are used to crimp burning type fuzes (that I believe use BP) to blasting caps. Bottom line is that in my mind it makes great sense to attach a really good ground to the metal table.
My limited experience in handloading BP cartridges is limited to 45-70 Trapdoor Springfield, and 56-50 Spencer rounds.