Discoverer

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Hmmm.
1. ALL bullets are "un-traceable" if the weapon from which they were fired is not registered to the shooter & destroyed or discarded immediately after firing. Crime Scene Investigators get nervous at any shooting if they find the weapon at the scene - because if it can't be traced to the shooter, and they can't be caught with it on their person, then ballistics evidence is useless.
2. One of the latest trends I've heard of is to shoot discarding sabot ammunition. You hear of hit-men collecting their spent brass, so as not to leave evidence at the scene, but it can be rather difficult to collect the used bullet, particularly if it is still in the target's body. But you can easily collect the spent sabot, thus removing ALL the ballistics evidence - when fired in a sabot, the bullet never makes contact with the barrel, so carries no evidentiary markings.
3. ANYTHING which does make contact with the barrel will collect ballistics evidence. Beckband's brittle steel-jacketed porcelain projectile, (?) will shatter on impact, but a good mortuary technician will collect all the little shards of the steel jacket and the ballistician will piece them together to "read" the striations left by the barrel. Another post refers to the ammo used by air-marshals, using many tiny lead balls, cast in resin and encased in a thin copper jacket - I've seen a shot from this type of ammo matched to the gun by the striations found in the several pieces of the copper jacket recovered from the body.
4. The original ice-bullet myth, (fairly comprehensively busted, I might add,) involved a projectile which would completely dissolve, leaving no trace at all, even throwing in to doubt whether the target had actually been shot at all. I have two thoughts on this.
A) As has been discussed at exhaustive length on this site before, the only means by which this might, theoretically, be possible, is to insulate the frozen projectile from both the heat of the propellant gasses, and the friction caused by high-velocity travel down the barrel. Although nobody has yet tried to experiment with it, I believe the only way this might be achieved is using discarding sabots in a large-bore air-weapon.
B) Why the hell would you want to? If the object is to evade capture, even if the Police can't prove someone was shot, or what with, they still have a body, and someone killed it. You can be damned sure they are going to investigate it! Which being the case, there are, as previously discussed, any number of ways of killing, and indeed shooting, someone, without leaving anything of any evidentiary value behind in the process, using methods and components which are relatively easily obtainable, without going to the inordinate lengths of creating an ice-bullet.
The simple, if rather sad fact is, that people are killed every day, using methods and weapons which leave the authorities unable to identify or prosecute the perpetrator afterwards. The only conceivable reason why anyone would want a mythical "disappearing bullet" at all, is because it looks sexy in a movie!
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