.280 Remington

.280 Remington
Type	Rifle
Place of origin	USA
Production history
Designer	Remington
Designed	1957
Manufacturer	Remington
Produced	1957-Present
Variants	.280 Ackley Improved
Specifications
Parent case	.30-06
Bullet diameter	.284 in (7.2 mm)
Neck diameter	.315 in (8.0 mm)
Shoulder diameter	.441 in (11.2 mm)
Base diameter	.470 in (11.9 mm)
Rim diameter	.473 in (12.0 mm)
Case length	2.540 in (64.5 mm)
Overall length	3.330 in (84.6 mm)
Case capacity	67.9 gr H2O (4.40 cm3)
Rifling twist	1 in 10 in (250 mm)
Primer type	Large rifle
Maximum pressure	60,000 psi (410 MPa)
Ballistic performance
Bullet mass/type Velocity Energy 120 gr (8 g) SP 3,112 ft/s (949 m/s) 2,581 ft·lbf (3,499 J) 140 gr (9 g) HP 2,839 ft/s (865 m/s) 2,506 ft·lbf (3,398 J) 154 gr (10 g) SP 2,825 ft/s (861 m/s) 2,730 ft·lbf (3,700 J) 168 gr (11 g) HPBT 2,723 ft/s (830 m/s) 2,767 ft·lbf (3,752 J) 175 gr (11 g) SP 2,681 ft/s (817 m/s) 2,794 ft·lbf (3,788 J)
Test barrel length: 24" Source(s): Accurate Powder

The .280 Remington, also known as the 7mm-06 Remington and 7mm Express Remington, was introduced in 1957 for the Remington model 740, 760, 721, and 725 rifles.

History

Having been released 32 years after the .270 Winchester, it had somewhat unspectacular sales. Remington renamed the cartridge in late 1978 to 7mm-06 Remington but just before the end of the year they renamed it again calling it the 7 mm Express in an attempt to increase sales. This resulted in people confusing it with the 7 mm Remington Magnum, and Remington changed the name back to .280 in 1981.^[1]

Specifications

The .280 is based on the .30-03 necked down to accept 7 mm (.284in) bullets, with the neck moved forward .050in (1.27mm). The neck was deliberately moved forward to prevent chambering in a .270 Winchester rifle, as firing a .280 round in a .270 would cause the projectile to get stuck in the barrel over pressuring the rifle and leading to a barrel rupture.

Original loadings were 125, 150 and 165 grain bullet weights.

.280 Remington vs .270 Winchester

The .280 Remington is capable of generating slightly higher velocities with a given bullet weight than the .270 Winchester, and also able to use heavier bullets due to the larger .284" diameter. .284" bullets also have higher ballistic coefficients at the top of the weight spectrum than .277" bullets. The greater energy and higher ballistic coefficient of heavier .284" bullets give the .280 Remington a slight ballistic advantage over the .270 Winchester.

.280 vs .30-06

The .280 Remington is capable of developing energy nearly equal to the .30-06 Springfield, but with lighter bullets having a better ballistic coefficient. The .30-06 produces more energy than the .280 with bullets heavier than 180 grains, though .284" 175 grain bullets have a high sectional density of .310, compared to the 30-06 180 grain bullet with a moderate sectional density of .271. The .280 is suitable for hunting any game in North America with good shot placement.

SAAMI pressure limit for the .280 Remington is set at 60,000 PSI, 50,000 CUP.

Most American rifle and ammunition manufacturers catalogue the .280 Remington.

In bolt action rifles the .280 Remington is not popular in Europe, where it competes with the 7×64mm, to which it is almost ballistically identical. But it does have a larger than expected number of European users in imported self-loading rifles such as those by Remington. When compared to the .280 Remington the 7x64mm has a slightly higher maximum allowed chamber pressure.

.280 Ackley Improved

.280 Ackley Improved on the right

One of P.O. Ackley's earliest wildcats was the 7mm-06 Improved, which was made by necking down the .30-06 Springfield case and fire-forming it to have less body taper and a 40-degree shoulder angle. Soon after the .280 Remington came out, Fred Huntington reformed its case to an improved configuration with minimum body taper, a 35-degree shoulder angle, and called it the .280 RCBS. Since cases for the .280 RCBS could be formed by firing .280 Remington ammo in a rifle chambered for the former, Ackley abandoned the 7mm-06 Improved and started chambering rifles for the .280 RCBS. He then changed the 35-degree shoulder to 40-degrees and the .280 Ackley Improved was born. If barrel length and chamber pressure are equal, the .280 Ackley Improved is about 100 fps faster with all bullet weights than the standard .280 Remington. In 2007, ammunition manufacturer Nosler registered the .280 Ackley Improved with SAAMI and began providing factory loaded ammunition and rifles for it.

See also

• 7mm Weatherby Magnum
• 7mm-08 Remington
• 7×57mm Mauser
• 7 mm caliber
• List of rifle cartridges
• Table of handgun and rifle cartridges
• Delta L problem
• Sectional density
• Ballistic coefficient
• 7mm-06
• .280 British

References

1. ↑ The Versatile 280 at Outdoor Life By Jim Carmichel, September 18, 2007

Remington Firearms and Cartridges
Rifles	Bolt-action JuniorTarget 521TL Remington-Keene rifle M1903 Springfield rifle Pattern 1914 Enfield M1917 Enfield Model 5 Model 6 Model 7 Model 30 Model 34 M40 Model 341 Model 504 Model 511 Model 512 Model 513 Model 521 Model 580 Model 581 Model 582 Model 600 Model 660 Model 673 Model 700 Model 710 Model 720 Model 721 Model 722 Model 725 Model 770 Model 788 Model 798 Model 799 M24 Sniper Weapon System M2010 Enhanced Sniper Rifle Modular Sniper Rifle Pump-action Model Six Model 14 Model 121 Model 141 Model 572 Model 572 Fieldmaster Model 760 Model 7600 Model 7615 Semi-automatic Nylon 66 Model Four Model 8 Model 24 Model 241 Model 522 Model 552 Model 597 Model 740 Model 742 Model 7400 Model 750 R5 Remington Gas System Model R-15 Model R-25 RSASS Automatic Adaptive Combat Rifle Single shot Rolling Block
Shotguns	Pump-action Model 10 and 29 Model 17 Model 31 Model 870 Model 887 Semi-automatic Model 11 Model 11-48 Model 58 Model 878 Model 1100 Model 11-87 Model SP-10 SPR 453 Break-action SPR 100 SPR 310
Handguns	Semi-automatic 1911 R1 Model 51 R51 RM380 RP9 Remington RP45 Revolver Model 1858 Model 1875 Model 1890 Derringer Model 95 Rider Single Shot Pistol Zig-Zag Derringer Other XP-100
Cartridges	.17 Remington Fireball .17 Remington 5mm Remington Magnum Rimfire .22 BR .22 Remington Jet .221 Remington Fireball .222 Remington .222 Remington Magnum .223 Remington .22-250 Remington 6mm BR 6mm Remington .25 Remington .257 Roberts .25-06 Remington .260 Remington 6.5mm Remington Magnum 7mm BR Remington 7mm-08 Remington .280 Remington 7mm Remington Magnum 7mm Remington Short Action Ultra Magnum .30 Remington .30 Remington AR .300 Remington Short Action Ultra Magnum .300 Remington Ultra Magnum .32 Remington 8mm Remington Magnum .338 Remington Ultra Magnum 7 mm Remington Ultra Magnum .35 Remington .35 Whelen .350 Remington Magnum .375 Remington Ultra Magnum .416 Remington Magnum .44 Remington Magnum