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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5-270 Gunwriters Cartridge
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<blockquote data-quote="shortgrass" data-source="post: 2870344" data-attributes="member: 24284"><p>Because there is .050" difference between the .270 case and the .280 case from base to shoulder? It was designed that way to prevent 280 from chambering in a 270 with its smaller bore. The .270 case won't fire in a 280ai chamber unless held against the bolt face somehow,,,, with the extractor or by jamming the bullet. .050" is a lot of stretch, length wise, for a brass case. Use .280 cases for any 280ai variant (.25/280ai, 6.5/280ai, 270/280ai??, straight .280ai, 30/280ai, or any others). There were many cartridge cases Ackley did not improve. Propellant selection then was not what it is today, and only a few Improved cartridges showed any "promise'. Today, we seem to call any cartridge that can be blown out at the shoulder with a 40*, using the 'parent' brass to do so, "Ackley Improved". It has been many years since I read "Handbook for Shooters and Reloaders", by P.O. Ackley,,, but it is a worthwhile read (2 books) if it can be found. It forms the basis of what we call today "Ackley Improved". No need to re-invent the wheel, especially if it's more complicated way of doing so. Years ago there was a popular wildcat where the .270 or .30/06 case was necked to 7mm, creating the 7mm/06 (.270 and /06 use the same headspace gages). That was pre .280 Rem, 7mmExpress Rem. Depending on throat length and barrel wear, a 7mm/06 cartridge might be forced into a 270 Win chamber with not so good results. At one time in the past RCBS made their own version of the .280ai, but it had a 30* shoulder. The .280 Rem case was the basis for that cartridge. Today it is common to see shoulder angles of 30* and 35*.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 2870344, member: 24284"] Because there is .050" difference between the .270 case and the .280 case from base to shoulder? It was designed that way to prevent 280 from chambering in a 270 with its smaller bore. The .270 case won't fire in a 280ai chamber unless held against the bolt face somehow,,,, with the extractor or by jamming the bullet. .050" is a lot of stretch, length wise, for a brass case. Use .280 cases for any 280ai variant (.25/280ai, 6.5/280ai, 270/280ai??, straight .280ai, 30/280ai, or any others). There were many cartridge cases Ackley did not improve. Propellant selection then was not what it is today, and only a few Improved cartridges showed any "promise'. Today, we seem to call any cartridge that can be blown out at the shoulder with a 40*, using the 'parent' brass to do so, "Ackley Improved". It has been many years since I read "Handbook for Shooters and Reloaders", by P.O. Ackley,,, but it is a worthwhile read (2 books) if it can be found. It forms the basis of what we call today "Ackley Improved". No need to re-invent the wheel, especially if it's more complicated way of doing so. Years ago there was a popular wildcat where the .270 or .30/06 case was necked to 7mm, creating the 7mm/06 (.270 and /06 use the same headspace gages). That was pre .280 Rem, 7mmExpress Rem. Depending on throat length and barrel wear, a 7mm/06 cartridge might be forced into a 270 Win chamber with not so good results. At one time in the past RCBS made their own version of the .280ai, but it had a 30* shoulder. The .280 Rem case was the basis for that cartridge. Today it is common to see shoulder angles of 30* and 35*. [/QUOTE]
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