[flipper35]

Originally Posted by oldE

Is it possible they developed some sort of discarded sabot round with a skirt which expands in the barrel to improve sealing then drops off to leave an aerodynamic shape?

Best
Les

They had these in rifle rounds, but were outlawed because they left no rifling marks.

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Joe Buettner
, translated gun manuals, tested ammunition, compiled gun laws
Answered 2 years ago · Upvoted by
Bill Caffrey
, Forty years of firearms experience; student of the gun. · Author has 1.7K answers and 14.4M answer views

.30–06 “accelerator” was an offering from Remington which put a 55 grain (3.56 gram) .224 caliber (5.7 millimeter) bullet inside a .30 caliber (~7.62 millimeter) plastic sabot, which is like a sleeve or shoe which holds bullets. This combination allowed a .30–06 Springfield cartridge to propel the bullet inside the sabot at velocities of around 4080 feet per second (~1243 meters per second). This is substantially faster than normal .30–06 velocities with heavier bullets, which average around 2800 feet per second (~853 meters per second).