In the world of spuds yesterday, I went down to the park for the first time this year to test some new ammo. Half the disks were faulty, we ran out of gas early, I had to demolish the breach to detach it after it got cross threaded, and a steel pipe nipple on the back got sheared cleanly in half when the recoil absorber slipped out of place, but me and a few people who came to watch got some good entertainment out of it while it lasted.
The ammo:
This round's aerodynamic qualities, penetration abilities, and stability are quite poor; it is designed solely for visual effect (and does quite a good job of it)
And the damage, on a misfire (disk failed at 150 psi):
The range shooting setup:

Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.