It is used as a sub-caliber cartridge for a recoiless rifle, usually a tracer round is used. The holes is the neck are created when it is fired, venting excess gas top the rear to match the ballistics of the RR round... and causing a truly horrendous noise!
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Old paratrooper in NC
Last edited by Trooperdan; 09-25-2020 at 01:31 PM.
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