Skip to main content

The Two Chambers of the .280 Ackley Improved

The Two Chambers of the .280 Ackley Improved

There are actually two ".280 Ackley Improved" chambers, and RCBS supplies dies for both.

Schematic Courtesy Of Nosler

There are actually two ".280 Ackley Improved" chambers, and RCBS supplies dies for both. The version with the pedigree that harks back to Ackley himself has a 40-degree shoulder, while the other is a modified version with a 30-degree shoulder said to feed better. I don't buy it, and judging by popularity ratio, neither do most others.

As an aside, when Nosler presented the 40-degree .280 AI to SAAMI for standardization, the base-to-shoulder length was shortened by a few thousandths. As a result, some variation from older .280 AIs exists in chambering reamers, dies, etc. Be aware of this condition and safely load for your rifle accordingly. Consult with your gunsmith or rifle manufacturer if you need help sorting it out.


GET THE NEWSLETTER Join the List and Never Miss a Thing.

Recommended Articles

See More Recommendations

Popular Videos

Tactical Solutions Introduces New X-Ring Takedown SBR Rifle

Tactical Solutions Introduces New X-Ring Takedown SBR Rifle

Keith Feeley of Tactical Solutions sat down with Michael Bane at SHOT Show 2018 to talk about the new X-Ring Takedown SBR .22LR rifle.

The Glock 21

The Glock 21

Frank and Tony from Gallery of Guns spice up the Glock test using their non-dominant hands.

Black Hills Evolution of Rifle Cartridge: .308 Win. 175 Gr. Match

Black Hills Evolution of Rifle Cartridge: .308 Win. 175 Gr. Match

David Fortier talks with Jeff Hoffman of Black Hills Ammunition about the evolution of the .308 Win. 175 Gr. Match bullet.

Skills Drills: 3-Second Headshot

Skills Drills: 3-Second Headshot

James Tarr runs through the 3-Second Headshot drill.

See More Popular Videos

Trending Articles

Would you take the extra power and pop of the .22 Magnum over the more price-effective .22 LR? Here's one man's opinion.Best Rimfire Cartridges — .22 Magnum vs .22 Long Rifle Ammo

Best Rimfire Cartridges — .22 Magnum vs .22 Long Rifle

Payton Miller - December 21, 2020

Would you take the extra power and pop of the .22 Magnum over the more price-effective .22 LR?...

Considering how popular the .270 Winchester has become, it's a great mystery why more .270 caliber (6.8mm) rifle cartridges  have not been introduced.5 Great .270 Rifle Cartridges Ammo

5 Great .270 Rifle Cartridges

Layne Simpson - May 28, 2019

Considering how popular the .270 Winchester has become, it's a great mystery why more .270...

Uberti's 1885 Courteney Stalking Rifle is a classically configured hunting rifle that's equally at home in the big whitetail woods and on the African savannas.Uberti 1885 Courteney Stalking Rifle Review Rifles

Uberti 1885 Courteney Stalking Rifle Review

Joseph von Benedikt - December 14, 2020

Uberti's 1885 Courteney Stalking Rifle is a classically configured hunting rifle that's...

How can a shorter-barrel revolver have higher velocities than a longer-barrel semiauto pistol? Here's why.Revolver vs. Semiauto Pistol: A Ballistic Oddity Handguns

Revolver vs. Semiauto Pistol: A Ballistic Oddity

Allan Jones - May 15, 2019

How can a shorter-barrel revolver have higher velocities than a longer-barrel semiauto pistol?...

See More Trending Articles

More Ammo

The new Winchester Active Duty 9mm ammo is loaded to the same military ballistics specifications as for the MHS program and has a rated muzzle velocity of 1,320 fps and a muzzle energy of 445 ft-lbs.Winchester Active Duty 9mm Ammo Review Ammo

Winchester Active Duty 9mm Ammo Review

Jake Edmondson - July 17, 2020

The new Winchester Active Duty 9mm ammo is loaded to the same military ballistics...

Even though muzzle flash has more effect on an observer than a shooter, reducing flash is always a good idea.Muzzle Flash and Other Distractions Ammo

Muzzle Flash and Other Distractions

Allan Jones - November 17, 2020

Even though muzzle flash has more effect on an observer than a shooter, reducing flash is...

Speer's 9mm Gold Dot CarryGun ammo is highly accurate and produces consistent velocities, extreme spreads and standard deviations.Speer 9mm Gold Dot CarryGun Ammo Ammo

Speer 9mm Gold Dot CarryGun Ammo

Joel J. Hutchcroft - November 11, 2020

Speer's 9mm Gold Dot CarryGun ammo is highly accurate and produces consistent velocities,...

A unique load for the .450 Bushmaster is Hornady's new Subsonic offering. It's loaded with the company's 395-grain Sub-X (Subsonic–eXpanding) bullet that is designed to expand and penetrate but not break up.Hornady .450 Bushmaster Subsonic Ammo Ammo

Hornady .450 Bushmaster Subsonic Ammo

Steve Gash - August 13, 2020

A unique load for the .450 Bushmaster is Hornady's new Subsonic offering. It's loaded with the...

See More Ammo

Magazine Cover

GET THE MAGAZINE Subscribe & Save

Digital Now Included!

SUBSCRIBE NOW

Give a Gift   |   Subscriber Services

PREVIEW THIS MONTH'S ISSUE Arrow

Buy Digital Single Issues

Don't miss an issue.
Buy single digital issue for your phone or tablet.

Buy Single Digital Issue on the Shooting Times App

Other Magazines

Special Interest Magazines

See All Special Interest Magazines

GET THE NEWSLETTER Join the List and Never Miss a Thing.

Phone Icon

Get Digital Access.

All Shooting Times subscribers now have digital access to their magazine content. This means you have the option to read your magazine on most popular phones and tablets.

To get started, click the link below to visit mymagnow.com and learn how to access your digital magazine.

Get Digital Access

Not a Subscriber?
Subscribe Now