I have started to make a few mods to my Dillon 650. So as I get each Mod completed I thought I might share these.
So my first modification was to polish the inside of the powder funnel to a mirror finish. I used a rigid cordless drill with (Mothers Power Cone (pictured below) the power cone is available at most automotive stores. I used 3m Ultrafine Machine Polish also pictured below. Total time for this project was about 20 minutes. The before and after pictures are also pictured below. The end result is that powder measure weights are now extremely consistent. If you have a dillon powder measure this is a really easy and cheap mod that anyone with a phillips screw driver and a cordless drill can do.
I will keep updating this thread with pictures as I complete more mods.