The Comp Bullet is a intriguing invention by an Italian firm of the same name. The bullet feature vents that, the company claims, increase velocity and reduce noise. Steve at The Firearms Blog writes:
Do you think they would work?
Link | Company Website
According to the company, these vents reduce friction by allowing gas to lubricate the bullet as it passes through the barrel and then act as a muzzle brake as the bullet exits the barrel. They apparently also reduce smoke, increase velocity (a rocket effect as they leave the barrel) and reduce muzzle flash. In other words, they are miracle bullets. [...]
As for the muzzle brake and "rocket" effect claim, the physics is beyond me. I cannot work out how gas venting out of the bullet for a brief moment in time would have any effect on recoil. Surely because the bullet is not fixed to the gun any muzzle brake effect would slow down the bullet not the recoil of the gun?
Do you think they would work?
Link | Company Website
The complete and utter lack of ballistic figures. If I invented and tested a super bullet, I would be telling the whole world what it could do.
This guy? About the only information is the bullet weight and diameter.
The firing demo videos show only someone firing rapidly with no appreciable recoil. Could be light loads or blanks. I'd be more impressed if he showed the target after firing. Not convinced anything even hit the target.
These are pure woo! Probably.