# US 2009/0260535 A1 · Shotgun Cartridge for Shotgun Shooting and Method in Shotgun Shooting > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2009/0260535 A1 - Document ID: US20090260535A1 - Status: Published application - Kind: A1 - Application number: 12/085,715 - Filed: 2006-12-08 - Published: 2009-10-22 - Earliest claimed: 2005-12-09 - Inventors: Kimmo Martikainen; Jaakko Lehtonen - Web page: https://patentgrep.com/patent/US20090260535A1 ## CPC - F42B 7/04: of pellet type - F42B 7/08: Wads, {i.e. projectile or shot carrying devices,} therefor - F42B 12/38: of tracer type - F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D) ## Abstract The invention relates to a shotgun cartridge for shotgun shooting. The shotgun cartridge includes a case and a case head in it, in the vicinity of a primer arranged in which, a propelling charge is arranged. Inside the case is a shot wad with shot pellets arranged inside it, which are arranged on the opposite side of the propelling charge to the primer, and between the propelling charge and the shot pellets is a gas wad. In addition, the shotgun cartridge includes a indicator piece, arranged inside the shot wad, on the shot pellets side of the gas wad, in which there is a space for a indicator agent. The indicator piece is arranged to be ejected from the case when the shotgun cartridge is fired by igniting the propelling charge with the primer. The outer diameter of the indicator piece essentially corresponds to the inner diameter of the shot wad, and the indicator piece is arranged against the end wall of the shot wad with the shot pellets lying freely against the indicator piece. In addition, the indicator agent is a fine-particle incombustible substance, which is arranged loosely in the space. ## Claims ### Claim 1 Shotgun cartridge for shotgun shooting, which shotgun cartridge includes a case and a case head at one end of it, a primer arranged in the case head and a propelling charge in the vicinity of it, a shot wad inside the case and shot pellets arranged inside it, which are arranged on the opposite side of the propelling charge to the primer, a gas wad between the propelling charge and the shot pellets, and a indicator piece, in which there is a space for a indicator agent, arranged inside the shot wad, on the shot side of the gas wad, and which indicator piece is arranged to be ejected from the case when the shotgun cartridge is fired by igniting the propelling charge with the primer, characterized in that the outer diameter of the indicator piece essentially corresponds to the inner diameter of the shot wad, and the indicator piece is arranged against the end wall of the shot wad with the shot pellets lying freely against the indicator piece, and the indicator agent is a fine-particle incombustible substance, which is arranged loosely in the space. ### Claim 2 (depends on 1) Shotgun cartridge according to claim 1, characterized in that the shot wad is arranged to be part of the gas wad and there is an cushioning part between the shot wad and the gas wad. ### Claim 3 (depends on 2) Shotgun cartridge according to claim 2, characterized in that the indicator agent is partly or entirely a coloured substance. ### Claim 4 (depends on 3) Shotgun cartridge according to any of claim 3, characterized in that the indicator piece is formed from an end piece and a body piece that is a continuation of it, in which the space is arranged. ### Claim 5 (depends on 4) Shotgun cartridge according to claim 4, characterized in that the face surface of the end piece is shaped in such a way that the air resistance creates a rotational motion in the indicator piece, which releases the indicator agent. ### Claim 6 (depends on 5) Shotgun cartridge according to claim 5, characterized in that there are at least two bevels in the face surface, which are arranged symmetrically relative to the central axis of the indicator piece. ### Claim 7 (depends on 6) Shotgun cartridge according to claim 6, characterized in that the specific weight of the indicator piece is 0.5-5.0 g/m3. ### Claim 8 Method in shotgun shooting, in which a target sent into a flight path is shot with a shotgun, and in which method a shotgun cartridge with a shot wad is used in the shotgun, inside which shotgun cartridge there is not only shot pellets, but also a indicator piece containing a indicator agent and fitted inside the shot wad, which is arranged to exit from the shotgun cartridge when the shotgun is fired, in order to determine possible errors in shotgun shooting, characterized in that in the method a indicator piece is used, the outer diameter of which essentially corresponds to the inner diameter of the shot wad, and the indicator piece is fitted against the end wall of the shot wad, the shot pellets lying freely against the indicator piece, and a fine-particle incombustible substance is used as the indicator agent, which is arranged loosely in the indicator piece, in order to form a momentarily observable indicator-agent cloud at the moment of firing. ### Claim 9 (depends on 8) Method according to claim 8, characterized in that a possible error and its magnitude are determined from the distance between the indicator-agent cloud and the target at the moment of firing. ### Claim 10 (depends on 9) Method according to claim 9, characterized in that the shotgun cartridge is arranged in such a way that the indicator agent discharges from the indicator piece between the shotgun and the intersection point of the flight paths of the shot pellets and the target. ### Claim 11 (depends on 10) Method according to any of claim 10, characterized in that the indicator piece is arranged in such a way that the indicator agent discharges from the indicator piece within 2-10milliseconds. ### Claim 12 (depends on 6) Shotgun cartridge according to claim 6, characterized in that the specific weight of the indicator piece is 2.0-4.0 g/m3. ### Claim 13 (depends on 10) Method according to any of claim 10, characterized in that the indicator piece is arranged in such a way that the indicator agent discharges from the indicator piece within 4-8 milliseconds.