08-10-2020, 11:02 PM
That last presentation linked in Stan's post ( https://ndiastorage.blob.core.usgovcloud...Schatz.pdf ) is the most thorough "lessons learned" report that I have seen about caseless ammo. It was written by someone who had considerable hands-on experience with the rifles and ammo and has photo's of different failure types. In the end, the author decided that some type of case, even if made of polymer, prevents a lot of the problems caseless ammo experienced in the field.
One thing that I like about True Velocity's "neckless" polymer cartridge design is that it permits a normal throat-leade section, allowing the full-diameter shank of the bullet to be near the lands. With both cased-telescoped and caseless-telescoped rounds, the bullet is inside the cartridge and must travel a significant distance before contacting the rifling. I would think that the long jump to the lands might lead to accuracy issues.
One thing that I like about True Velocity's "neckless" polymer cartridge design is that it permits a normal throat-leade section, allowing the full-diameter shank of the bullet to be near the lands. With both cased-telescoped and caseless-telescoped rounds, the bullet is inside the cartridge and must travel a significant distance before contacting the rifling. I would think that the long jump to the lands might lead to accuracy issues.