I am going down the powder coating path and this is my first try with the cheap electrostatic PC gun.
I have done some 310 Cadet bullets by tumblimg them in a solo cup with some airsoft balls to generate the static to get the powder to adhere to the bullet. It works OK but moving them from the cup to the baking sheet causes scratches and is tedious.
The coverage with the gun is definitely better but there is a lot of lost powder on the foil. I think I can place them closer together but with such tall bullets I was worried about getting good coverage on the sides. I say "a lot" but really, it is not that much powder. If I get a full sized oven and place the bullets closer together I feel the loss will be minimal.
These are plain based bullets as cast which I will size to .410" and shoot at normal cast velocities although I am tempted to run a few at full speed and see how they do. The PC bullets can take full velocity normally but most guys are using gas checked bullets either coated before the check or with the check.
I may throw a lubed wad in there just to protect the base.

They started about .408" and now measure .411-.412" so I might be laying it on a little heavy with the gun.
Sure look nice though.

On the way into the toaster oven.

I think they are looking pretty darn good!

These 310 Cadet bullets were dry tumbled in the solo cup

More 310 Cadet but done with the gun. Ignore the two wrinkly ones there.