Sorry for the confusion, it was perfectly clear to me as I was doing it…
Alex is correct, that was my powder dumping container, there is powder from three previous 20’s. then the oatmeal off to the side. If you look carefully there are at least two slight powder variations.
Personal preference, I’m not a big fan of inertial bullet pullers for calibers .50 and up. We have all seen the pictures of mistakes that have been made with German and Argentine rounds at the .30 level, the penalties get progressively worse as you go up in caliber. That and in regard to 20mm and up, it seems that the more I learn the less I know. So many of the variations are poorly documented, or the documentation is so poorly distributed that surprises are common. Even with periodic access to X-ray equipment I am seldom comfortable with submitting many of these rounds to shock energy, especially in a forward motion.
Instead, completely lacking in any practical skills of my own, I convinced a friend to build the following -
On the left is the bottom plate, with a hole for insertion of the cartridge. Two threaded rods are secured to the bottom plate and further up have nuts and a pusher plate dropped on from the top. The pusher plate has an opening for the projectile to extend through, and fitted clamp is attached to the projectile. this clamp covers the full length of the projectile, giving the most surface area to grab while doing the least possible amount of damage to the body, paint and markings.
A fitted key is slipped over the extractor groove of the case to hold the cartridge is place. The bottom plate is then secured into a vise and using a suitable wrench the nuts are simply “unscrewed”, slowly pushing the plate upwards and extracting the projectile.
One late addition was a rotating metal “tab” on the bottom of the puller. It was discovered the hard way that some cartridges (i.e. 20x102) are crimped heavily enough that the projectile/case may release suddenly, allowing the case and powder to ricochet about the room. Rotating the tab before unscrewing prevents this from happening.
Years ago we used a similar device for large caliber rounds - 75mm, 105mm, Flak 88 etc. In that case guide rods replaced the threaded rods and the upward pressure was supplied by two hydraulic jacks.
As mentioned I also have a larger version for use with larger medium caliber rounds. It is currently set up for 40mm, but can easily handle smaller calibers. In particular I have a number of 25mm Bradley cases that still contain powder and need to be cleaned up.
This tool is still being refined and we have some improvements to still explore. In particular, since the device does such an excellent job in extraction without damage or belling the mouth of the case, it can be difficult to replace the projectile into the case once the powder is removed. In theory the process can be done in reverse, but it is slightly problematic with some rounds, with rims getting in the way, the cartridge not as stable under pressure, etc. A work in progress.