Other hollow or tubular projectile ”projects” primarily looking at higher velocity and flat trajectory-
Pistol caliber; rifle fired grenade ring airfoil projectile (RAP) (tubular projectiles): viewtopic.php?f=1&t=4583
0.65 Cal. TUBULAR PROJECTILE RESEARCH 2004. This refers to a DTIC listing entitled Summary of .65 Caliber Tubular Projectile Characteristics (a Powerpoint presentation) by Abe Flatau (developer of the Ring Airfoil rifle grenade & Ring Airfoil Projectile (RAP) nonlethal rubber projectile discussed in the IAA Forum thread listed above) with a title page of “Some Comments Regarding Performance Potential for a New Machine Gun and Ammunition Concepts”
[b]Photo showing cartridge comparison including .65 tubular projectile cartridge, photo from the DTIC listed presentation shown above.
[/b]20 mm Tubular Projectiles, 1944. RETARDATION OF TUBULAR PROJECTILES DEVELOPED FROM THE 20MM AMER ICAN BALL. dtic.mil/dtic/tr/fulltext/u2/491944.pdf
30 mm Tubular Projectiles 1984. 30-MM TUBULAR PROJECTILE. dtic.mil/dtic/tr/fulltext/u2/b087370.pdf
Pictures and description of a 25x137mm cartridge with a tubular projectile. Described as a Dutch experimental projectile designed and tested by the former NWM (you have to log in to see the pictures). bocn.co.uk/vbforum/threads/5 … 2-chaingun