Base bleed and rocket assisted shells are quite different. Base bleed works in a totally different manner to rocket assisted shells. Base bleed is there to increase range, typically by about 20–35%. It expels gas into the low pressure area behind the shell to reduce base drag (it does not produce thrust; if it did it would be a rocket-assisted projectile). Because of it’s nature you lose a little bit of accuracy. This type of shell, as it decreases drag, it detains more of it’s initial momentum and can hit targets harder and farther.
Rocket Assisted Projectiles (RAP) however , have a small rocket engine to provide extra thrust and range. Including US army a number of militaries use these shells in their howitzers.
It would be expensive and difficult to incorporate these two technologies in to, especially smaller caliber rounds.
By designing a more aerodynamic shaped core/round it is possible to substantially increase the range of that round. BAE Systems and US Navy have proven this with the introduction of Hyper Velocity Projectiles (HVP)
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Last summer USS Dewey (DDG-105) fired 20 hyper velocity projectiles (HVP) from a standard Mk 45 5-inch deck gun in a quiet experiment that’s set to add new utility to the weapon found on almost every U.S. warship, officials familiar with the test have told USNI News. The test, conducted by the...
news.usni.org
If this ebabil is not a hoax, then the secret may lie in the design of it’s shape and the materials used in the core.