US 12,352,545 B2
Reduced stiffness barrel fired projectile
Bryan P. Peterson, Isanti, MN (US)
Assigned to Federal Cartridge Company, Anoka, MN (US)
Filed by Federal Cartridge Company, Anoka, MN (US)
Filed on Sep. 8, 2023, as Appl. No. 18/244,046.
Application 18/244,046 is a continuation of application No. 17/745,266, filed on May 16, 2022, granted, now 11,781,843.
Application 17/745,266 is a continuation of application No. 16/513,377, filed on Jul. 16, 2019, granted, now 11,333,472, issued on May 17, 2022.
Claims priority of provisional application 62/698,450, filed on Jul. 16, 2018.
Prior Publication US 2024/0093980 A1, Mar. 21, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F42B 14/00 (2006.01); F42B 5/28 (2006.01); F42B 12/74 (2006.01)
CPC F42B 14/00 (2013.01) [F42B 5/28 (2013.01); F42B 12/74 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A projectile having:
a projectile body including a tail portion, a nose portion, a barrel engaging portion between the nose portion and the tail portion,
the projectile comprising a metal jacket that extends from the tail portion to at least the nose portion and that defines an exterior of the projectile the metal jacket extending around an interior core,
wherein the portions of the projectile body are arranged along a central longitudinal axis; and
wherein a plurality of circumferential grooves are defined in the interior core and not in the metal jacket, each of the one or more circumferential grooves covered by and positioned adjacent to the metal jacket;
wherein during firing of the projectile, the one or more circumferential grooves define a void that allows material of the metal jacket and interior core to displace into the void for reduction in radial stiffness to the projectile in the barrel engaging portion.