.410 bore

.410 bore
From left to right: a .45 ACP, a .410 bore shotshell, a 20 gauge shotshell, and a 12 gauge shotshell
Type	Shotgun, revolver, derringer
Place of origin	United Kingdom
Production history
Manufacturer	Eley Brothers
Produced	1874–present
Specifications
Case type	Rimmed, straight
Bullet diameter	.410 in (10.4 mm)
Neck diameter	.455 in (11.6 mm)
Base diameter	.470 in (11.9 mm)
Rim diameter	.535 in (13.6 mm)
Rim thickness	.060 in (1.5 mm)
Overall length	2 in (51 mm) ⁠2+1/2⁠ in (64 mm) 3 in (76 mm)
Primer type	Shotshell primer
Maximum pressure (SAAMI)	12,500 psi (86 MPa) (for ⁠2+1/2⁠ in (64 mm) length shells)[1]
Maximum pressure (SAAMI)	13,500 psi (93 MPa) (for 3 in (76 mm) length shells)[2]
Ballistic performance
Bullet mass/type Velocity Energy 109.375 gr (7 g) Federal ⁠2+1/2⁠ in ⁠+1/4⁠ oz. slug 1,780 ft/s (540 m/s) 769 ft⋅lbf (1,043 J) 109.375 gr (7 g) Winchester 3 in ⁠+1/4⁠ oz. slug 1,800 ft/s (550 m/s) 787 ft⋅lbf (1,067 J) 350 gr (23 g) 3 in Winchester No. 000 buckshot (5 pellets) 1300 ft/s (396.24 m/s) 1,313 ft⋅lbf (1,780 J) 328.125 gr (21 g) Winchester 3 in ⁠+3/4⁠ oz. No. 6 shot 1100 ft/s (335.28 m/s) 882 ft⋅lbf (1,196 J) 218.75 gr (14 g) Remington ⁠2+1/2⁠ in ⁠+1/2⁠ oz. No. ⁠7+1/2⁠ shot 1,200 ft/s (370 m/s) 699 ft⋅lbf (948 J)

The .410 bore (10.4 mm) is one of the smallest caliber of shotgun shell commonly available (along with the 9mm Flobert rimfire cartridge, and the less common .22 rimfire shot shell). A .410 bore shotgun loaded with shot shells is well suited for small game hunting and pest control. The .410 started off in the United Kingdom as a garden gun along with the .360 and the No. 3 bore (9 mm) rimfire, No. 2 bore (7 mm) rimfire, and No. 1 bore (6 mm) rimfire. .410 shells have similar base dimensions to the .45 Colt cartridge, allowing many single-shot firearms, as well as derringers and revolvers chambered in that caliber, to fire .410 shot shells without any modifications.