Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Gunsmithing
280 Ackley Chamber
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="shortgrass" data-source="post: 2096129" data-attributes="member: 24284"><p>Every Ackley Improved chamber, that P.O. Ackley himself designed, is <em><strong>shorter in length/depth</strong></em> ( by .004-.006") than the parent cartridge. The parent case inserted into the Improved chamber is "trapped" between the bolt face and the neck/shoulder junction. This insures that when the cartridge is fired that it will stretch at the front shoulder to meet the chamber (fire form), and not at the rear where you need the the strength (thickness) of the brass case. I have chambered, in my shop, .220 Swift AI, .223 AI, .22/250AI, .243 AI, 6mm Rem AI,.257 Roberts AI, .260 Rem AI, .280 Rem AI, and .338/06AI. These are all done in the 'traditional' manner as prescribed by P.O. Ackley. Only the new SAAMI version of the .280 AI seems to give trouble to those who are new to the Ackley Improved cartridges. I have the newer SAAMI .280 AI reamer and head space gauges and give my client the choice when I get a chamber job for that one. On a 'hunting' rifle I generally chamber to the "GO" gauge + .002" deeper (hey, the idea of the Ackley Improved is to increase case capacity and 'improve' the shoulder for better combustion of the propellant, isn't it?). In this way the reloader has no trouble 'bumping' the shoulder back a bit with any production sizing die. Not everyone is willing or can afford to run out and order a custom sizing die if an 'off the shelf' RCBS or Redding isn't working for them. I will chamber to "GO" + .000" upon request. The .280 AI is the only improved that seems to give some people problems. There is a lot of disagreement among gunsmiths and gun writers about the .280AI verses the .280 traditional Ackley. I have been chambering since '92, and I have been machining since '74. All I can do is relay my personal experience with the .280 Improved cartridges. Both of my .280 AI reamers and gauge sets were made by Dave Mansons' shop.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 2096129, member: 24284"] Every Ackley Improved chamber, that P.O. Ackley himself designed, is [I][B]shorter in length/depth[/B][/I] ( by .004-.006") than the parent cartridge. The parent case inserted into the Improved chamber is "trapped" between the bolt face and the neck/shoulder junction. This insures that when the cartridge is fired that it will stretch at the front shoulder to meet the chamber (fire form), and not at the rear where you need the the strength (thickness) of the brass case. I have chambered, in my shop, .220 Swift AI, .223 AI, .22/250AI, .243 AI, 6mm Rem AI,.257 Roberts AI, .260 Rem AI, .280 Rem AI, and .338/06AI. These are all done in the 'traditional' manner as prescribed by P.O. Ackley. Only the new SAAMI version of the .280 AI seems to give trouble to those who are new to the Ackley Improved cartridges. I have the newer SAAMI .280 AI reamer and head space gauges and give my client the choice when I get a chamber job for that one. On a 'hunting' rifle I generally chamber to the "GO" gauge + .002" deeper (hey, the idea of the Ackley Improved is to increase case capacity and 'improve' the shoulder for better combustion of the propellant, isn't it?). In this way the reloader has no trouble 'bumping' the shoulder back a bit with any production sizing die. Not everyone is willing or can afford to run out and order a custom sizing die if an 'off the shelf' RCBS or Redding isn't working for them. I will chamber to "GO" + .000" upon request. The .280 AI is the only improved that seems to give some people problems. There is a lot of disagreement among gunsmiths and gun writers about the .280AI verses the .280 traditional Ackley. I have been chambering since '92, and I have been machining since '74. All I can do is relay my personal experience with the .280 Improved cartridges. Both of my .280 AI reamers and gauge sets were made by Dave Mansons' shop. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Gunsmithing
280 Ackley Chamber
Top