This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.
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Guys, how do these work? I have tried to google more information, but no luck.
The 6.8 True Velocity shows it pretty well:
Rather then having a 'neck' it uses polymer to make the shoulder of the cartridge into a block of plastic with a hole in it, which serves as a sort of 'internal neck.'
This can be used to either increase ogive space, or increase powder capacity. Or in the 6.8's case, seems to be a bit of both.
The added advantage is that it makes the polymer cartridge much more durable. Rather then the bullet being held in place by ~1mm or less of plastic, the bullet is embedded in a ~10mm circle of solid plastic.
Thank you! This is interesting.
The idea goes back quite a long way. The 25 x 145 shown fourth from the left below was made by AAI in 1973.
Is this technology now considered mature?