lakeroadster
When in doubt... build hell-for-stout!
I stumbled on a video of this, and thanks to @Steve Shannon Identified it as a M1147 Tank Round.
Here are some video's of it in action:
Here's a quick Open Rocket simulation I did. Its powered by a 24mm motor.
Here are some video's of it in action:
Northrop Grumman Unveils M1147 Advanced Multi-Purpose (AMP) Round
Here's a quick Open Rocket simulation I did. Its powered by a 24mm motor.