A patterned abrasion caused by the impact of a cartridge case may simulate an atypical muzzle imprint mark

Krämer, Lena Violetta; Nadjem, Hadi; Glardon, Matthieu; Kneubuehl, Beat P.; Pollak, Stefan; Perdekamp, M. Große; Pircher, Rebecca

doi:10.1007/s00414-015-1281-4

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Apart from the abovementioned weapon components, there may be additional constituents contributing to the muzzle imprint such as the folded shoulder stocks in submachine guns [26] or ramrods in muzzleloaders [27]. A case impact mark located close to a gunshot entrance wound can simulate a component of the muzzle imprint [28].…”

Section: Discussionmentioning

confidence: 99%

Rearward movement of the slide in semi-automatic pistols: a factor potentially influencing the configuration of muzzle imprint marks in contact shots

et al. 2018

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A muzzle imprint mark is a highly diagnostic finding, which indicates a contact shot. In many cases, it also provides additional information on the type of the weapon used and on the way in which it was held at the time of firing. In semi-automatic pistols, some constructional elements constituting the muzzle plane move to the rear together with the slide, which may prevent them from causing a corresponding imprint close to the bullet entrance hole. The present study comprises 30 consecutive autopsy cases of fatal contact shots to the head inflicted with semi-automatic pistols. The imprint marks accompanying the entrance wounds were compared with the muzzle ends of the respective weapons both before and after retracting the slide. It turned out that in a considerable number of cases (3 out of 30), the retractable parts were not depicted or only to a minor degree as components of the imprint mark. In order to validate the presumed correlation, experimental shots were fired to composite models using pistols in which the movable and the stationary parts forming the muzzle plane were dyed with different paints. Thus, it could be demonstrated that the muzzle imprint preferentially mirrors the front sides of the stationary parts such as the barrel end, the recoil guide, and the gun housing. Immediately after discharge, the slide and the ballooning skin of the bullet entrance site move in the same direction. The stationary parts of the weapon block the expansion of the skin bulging towards the muzzle, so that the skin gets firmly pressed against them. The dynamic interaction between the gun and the entrance region resulting in a characteristic imprint mark could be visualized by the use of a high-speed motion camera recording test shots to different composite models.

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Section: Discussionmentioning

confidence: 99%

Rearward movement of the slide in semi-automatic pistols: a factor potentially influencing the configuration of muzzle imprint marks in contact shots

et al. 2018

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“…The energy density of ricocheting cartridge cases was deemed to be insufficient to inflict this lesion. This resulted in the conclusion that the lesion was probably caused by a cartridge case which became stuck in the ejection port [ 185 ].…”

Section: Wound Ballisticsmentioning

confidence: 99%

Interpol review of forensic firearm examination 2016-2019

Mattijssen

2020

Forensic Science International: Synergy

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Messung der Geschossgeschwindigkeit mittels Hochgeschwindigkeitskamera

2017

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Messung der Geschossgeschwindigkeit mittels HochgeschwindigkeitskameraIn der Ballistik ist die Bestimmung der Geschossgeschwindigkeit v essenziell, um aus der bekannten Geschossmasse m die Geschossenergie E = 1/2 mv 2 errechnen zu können. Üblicherweise werden zurGeschwindigkeitsmessung Lichtschranken verwendet. Je nach Versuchsaufbau kann dieses Verfahren jedoch nicht immer eingesetzt werden. Deshalb wurde überprüft, ob sich die Geschossgeschwindigkeit auch mit einer Hochgeschwindigkeitskamera ausreichend genau ermitteln lässt. Einleitung In der forensischen Praxis gibt es eine Vielzahl dynamischer Prozesse, deren Geschwindigkeit das menschliche Auge überfordert. Auch mit konventionellen Videoaufzeichnungen (30-60 Bilder/s, Abb. 1 8 Fortschritt des 10,2 g schweren Geschosses Kaliber 9 mm Luger in 0,48 ms, Geschwindigkeit im Bild 255m/s, Bildbreite 149 mm. Zwischen den Aufnahmen liegen 80 μs. Anfangs ist noch Mündungsfeuer im Bild. Man beachte das Feld-Zug-Profil und dessen Bewegung durch die Geschossrotation um die Längsachse (Drall) Abb. 3 8 7,65 Browning. Obere Reihe scharf abgebildet, 1,4 % Messfehler. Mittlere Reihe unscharf, 3,8 % Messfehler. Untere Reihe gut abgebildet, 2,4 % Messfehler (Durchschnitt in dieser Serie). Man beachte die Ausbreitung der Schmauchschwaden Rechtsmedizin 4 • 2017 273 Originalien Abb. 4 8 Serie mit 7,65 Browning (n = 48), die bei breit gestreuten Längen der jeweiligen Messstrecken keine Abhängigkeit des Messfehlers erkennen lässt. Vier-Quadranten-Darstellung des Messfehlers in Abhängigkeit von der gewählten Messstrecke (Zeit zwischen den Messbildern). Die Spannweite der x-Werte (Zeit) entspricht einer Messstrecke von 65-144mm. Das rote Achsenkreuz markiert den Median. Sich überlagernde Bildpunkte sind dunkler dargestellt

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A patterned abrasion caused by the impact of a cartridge case may simulate an atypical muzzle imprint mark

Cited by 4 publications

References 11 publications

Rearward movement of the slide in semi-automatic pistols: a factor potentially influencing the configuration of muzzle imprint marks in contact shots

Rearward movement of the slide in semi-automatic pistols: a factor potentially influencing the configuration of muzzle imprint marks in contact shots

Interpol review of forensic firearm examination 2016-2019

Messung der Geschossgeschwindigkeit mittels Hochgeschwindigkeitskamera

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