eISSN: 2469-2794
Submit manuscript...
Research Article Volume 13 Issue 4
Experimental study on exclusively the size and morphology of the gas dispersion cone in 5.56 mm and 7.62 mm rifles – used by core (special resources coordination) / pcerj (civil police of the state of Rio de Janeiro)
Claude Jacques Chambriard, Gabriel Lott Pereira Martins, Carlos Alexandre Santos, Ryan de Mello Santos
Received: December 15, 2025 | Published: December 31, 2025
Citation: Chambriard CJ, Martins GLP, Santos CA, et al. Experimental study only size and morphologygas dispersion cone for 5.56 mm and 7.62 mm rifles – used by core (special resources coordination) / pcerj (civil police of the state of rio de janeiro). Forensic Res Criminol Int J. 2025;13(4):188-193. DOI: 10.15406/frcij.2025.13.00458
Abstract
This experimental study aimed to observe, record, and document the dimensions of the gas and residue dispersion cone produced at the moment of firing rifles chambered in 5.56 × 45 mm NATO and 7.62 × 51 mm NATO, which are operationally used by CORE/PCERJ personnel. The investigation focused exclusively on the geometric characterization of the dispersion cone, analyzing its shape, amplitude, and visible boundaries at different distances between the muzzle and the target, specifically 15 cm, 30 cm, 50 cm, and 1.0 meter. The experiment was conducted in a closed, non-ventilated environment in order to minimize external environmental interference and ensure greater control of the variables involved. The results allowed for the objective documentation of the dispersion cone configuration and its progressive reduction as distance increased, providing relevant technical support for forensic ballistic interpretation, reconstruction of firearm-related events, and the improvement of police training activities.
Keywords: Dispersion con, muzzle gases, long guns, firearm forensics, ballistic analysis
©2025 Chambriard, et al. This is an open access article distributed under the terms of the, which permits unrestricted use, distribution, and build upon your work non-commercially.