US 11,815,342 B2
Method for making precision rifle ammunition with more uniform external ballistic performance and enhanced terminal ballistic performance
G. David Tubb, Canadian, TX (US)
Assigned to Superior Shooting Systems, Inc., Canadian, TX (US)
Filed by SUPERIOR SHOOTINGS SYSTEMS, INC, Canadian, TX (US)
Filed on Aug. 22, 2022, as Appl. No. 17/892,892.
Application 17/892,892 is a division of application No. 16/726,674, filed on Dec. 24, 2019, granted, now 11,421,967.
Application 16/726,674 is a continuation of application No. PCT/US2018/039602, filed on Jun. 26, 2018.
Claims priority of provisional application 62/525,185, filed on Jun. 26, 2017.
Prior Publication US 2023/0056228 A1, Feb. 23, 2023
Int. Cl. F42B 5/02 (2006.01); F42B 10/44 (2006.01); F42B 10/46 (2006.01); F42B 12/74 (2006.01); F42B 12/76 (2006.01)
CPC F42B 5/025 (2013.01) [F42B 10/44 (2013.01); F42B 10/46 (2013.01); F42B 12/74 (2013.01); F42B 12/76 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for making an enhanced projectile, comprising:
providing a projectile body (e.g., 360, 460) comprising a distal first section (e.g., 368, 468), a bearing second section (e.g., 370, 470), and a proximal third section (e.g., 372, 472), all aligned along a central axis (e.g., 366, 466), wherein each of the first, second and third sections are substantially symmetrical about the central axis, wherein the projectile body has an overall length defined along the central axis between a distal end and a proximal end of the projectile body, wherein the distal first section of the projectile body comprises an ogive surface with a continuous surface profile defining a transition between the ogive surface and the bearing second section, wherein the distal first section terminates distally in a tip or a meplat (e.g., 362, 462) at the distal end, wherein the projectile body has a selected Caliber corresponding to a widest outside diameter of the bearing second section (e.g., 370 or 470), wherein the overall length of the projectile body is at least 5 times the widest outside diameter, and wherein the distal first section has an ogive surface profile radius or Caliber of Ogive that is greater than 7; and
modifying the ogive surface to provide a surface discontinuity defining feature into the ogive surface of the distal first section of the projectile body to create an unsupported surface gap in the continuous surface profile to define an external ballistic effect uniforming surface discontinuity (e.g., 369, 469) therein which affects the flow of air over a front half of the distal first section, wherein the surface discontinuity defining feature is cut to a selected profile and depth and is located in proximity to the tip or meplat.