I had some of those oddball Hornady cases that are shorter and modified them for a 209 shotgun primer only...no powder needed.
Make up the hardwood bullets from wood dowel material and cut the O-ring grooves. O-ring installed measures .463 on the .435 diameter bullet letting the O-ring seal bullet in case and only the O-ring rides in the rifling sealing the bore. Bullet weight 28.5-30 gr.
They work fairly well in revolvers and will go thru plastic milk jug of water. You can recover the bullet and reuse.
Range report soon!

