# US 10,480,917 B2 · Projectile with enhanced ballistic efficiency > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,917 B2 - Document ID: US10480917B2 - Status: Granted - Kind: B2 - Application number: 16/230,105 - Filed: 2018-12-21 - Published: 2019-05-09 - Granted: 2019-11-19 - Earliest claimed: 2016-01-15 - Assignees: Brown Dog Intellectual Properties - Applicants: Joshua M. Kunz; Francis J. Sheer - Inventors: Joshua M. Kunz; Francis J. Sheer - Web page: https://patentgrep.com/patent/US10480917B2 ## CPC - F42B 14/02: Driving bands; Rotating bands (F42B14/04 takes precedence) - F42B 10/44: Boat-tails specially adapted for drag reduction - F42B 12/74: of the core or solid body - F42B 12/745: {the core being made of plastics; Compounds or blends of plastics and other materials, e.g. fillers} - F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D) ## Abstract A projectile for use with a firearm having a rifled barrel including helical grooves extending longitudinally along an inner surface thereof can include: a substantially cylindrical projectile body having at a front end an ogival nose section and at a rear end a tail section; a driving band section formed on the projectile body between the nose section and the tail section; a bore rider section formed on the projectile body between the nose section and the tail section; and a pilot band section formed on the projectile body forward of the driving band section. The pilot band section can be formed having an LD-Haack profile. ## Claims ### Claim 1 A projectile for use with a firearm having a rifled barrel including helical grooves extending longitudinally along an inner surface thereof, the projectile comprising: a substantially cylindrical projectile body having at a front end an ogival nose section and at a rear end a tail section; a driving band section formed on the projectile body between the nose section and the tail section; a bore rider section formed on the projectile body between the nose section and the tail section; and a pilot band section formed on the projectile body forward of the driving band section, wherein the pilot band section is formed having an LD-Haack profile. ### Claim 2 (depends on 1) The projectile of claim 1, wherein the bore rider section is disposed between the pilot band section and the driving band section. ### Claim 3 (depends on 1) The projectile of claim 1, wherein the bore rider section is in contact with the pilot band section. ### Claim 4 (depends on 1) The projectile of claim 1, wherein the pilot band section is disposed aft of a distal-most end of the ogive. ### Claim 5 (depends on 1) The projectile of claim 1, wherein the pilot band section is geometrically distinct from the ogive. ### Claim 6 (depends on 1) The projectile of claim 1, wherein the bore rider section is formed to contact an inner surface of a bore of the barrel, and the driving band section is formed to engage the grooves of the barrel. ### Claim 7 (depends on 1) The projectile of claim 1, further comprising: helical recessed regions formed in an outer surface of the projectile body and longitudinally extending along a portion of the projectile body. ### Claim 8 (depends on 7) The projectile of claim 7, wherein the recessed regions longitudinally extend along the driving band section. ### Claim 9 (depends on 1) The projectile of claim 1, further comprising: a driving band lead-on section formed on the projectile body adjacent to the driving band section on a forward side thereof and having an angled surface, with respect to a horizontal axis of the projectile body, that forms a transition from the driving band section to a portion of the projectile body adjacent to the driving band lead-on section on a forward side thereof. ### Claim 10 (depends on 9) The projectile of claim 9, further comprising: a driving band lead-off section formed on the projectile body adjacent to the driving band section on a rearward side thereof and having an angled surface, with respect to the horizontal axis of the projectile body, that forms a transition from the driving band section to a portion of the projectile body adjacent to the driving band lead-off section on a rearward side thereof. ### Claim 11 (depends on 10) The projectile of claim 10, wherein at least one of the wherein the driving band lead-on section and the driving band lead-off section is formed having an LD-Haack profile. ### Claim 12 (depends on 10) The projectile of claim 10, wherein the bore rider section is adjacent to the driving band lead-off section on the rearward side thereof. ### Claim 13 (depends on 10) The projectile of claim 10, wherein the ogival nose section is adjacent to the driving band lead-on section on the forward side thereof. ### Claim 14 (depends on 1) The projectile of claim 1, further comprising: a tail transition section formed on the projectile body adjacent to the tail section on a forward side thereof and having an angled surface, with respect to a horizontal axis of the projectile body, that forms a transition from the tail section to a portion of the projectile body adjacent to the tail transition section on a forward side thereof. ### Claim 15 (depends on 1) The projectile of claim 1, wherein a tip of the nose section is spherically blunted. ### Claim 16 (depends on 1) The projectile of claim 1, wherein the nose section is formed having an LD-Haack shape. ### Claim 17 (depends on 1) The projectile of claim 1, wherein the projectile body is a monolithically formed body. ### Claim 18 (depends on 1) The projectile of claim 1, wherein the tail section is formed having a boat tail shape. ### Claim 19 (depends on 1) The projectile of claim 1, wherein the projectile body is made of at least one solid material selected from a group consisting of: copper, a copper alloy, aluminum, tungsten, a polymeric material, and a synthetic material. ### Claim 20 (depends on 1) The projectile of claim 1, wherein the projectile body is made at least partially of a copper alloy that is C14-700 with a work hardness of at least half hard.