NCJ Number
138340
Journal
Journal of Forensic Sciences Volume: 37 Issue: 4 Dated: (July 1992) Pages: 1023-1029
Date Published
1992
Length
7 pages
Annotation
Many buckshot and larger diameter birdshot shotgun shells contain granulated plastic shot buffer, and the presence of granulated buffer at a shooting scene provides valuable and immediate evidence of weapon and ammunition type.
Abstract
This study aimed to develop guidelines as to the maximum muzzle distance at which buffer could be recovered, the maximum diameter of buffer distribution, the distribution of buffer along the ground beyond the firearm, and the ability of buffer to penetrate light clothing. Two .12-gauge shotguns were used, one with a 27-inch barrel and a full choke and the other with an 18-inch barrel and a cylinder bore. Shooting was done both indoors and outdoors. Findings revealed adherent buffer on targets up to 20 feet from the muzzle. Buffer penetrated light cotton cloth at ranges up to or nearly up to the maximum range of adherent buffer on plain felt targets. The diameter of buffer spread was up to 10 times that of pellet spread. The buffer distribution diameter peaked at 3.3 feet between the 8- to 10-foot range of fire and remained roughly constant at 28 inches throughout the buffer adherence range beyond 10 feet. Along the ground, buffer was demonstrated up to 30 feet from the muzzle but was concentrated in the 12- to 22-foot range. Buffer clearly could be deposited on objects not struck by pellets. The presence of buffer, but not its distribution diameter, was helpful in determining range of fire. 3 references and 4 figures