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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
280AI with too much head space...options?
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<blockquote data-quote="25WSM" data-source="post: 1924755" data-attributes="member: 38048"><p>Hayudog, I've been building 280AI rifles for 30 yrs. If your smith didn't set the barrel back any then he couldn't do a proper chamber. A 280AI original and new are set to the SAME headspace. It's . 004 shorter than the reg 280Rem. You can't have a reg 280Rem and just run the reamer in and make it . 004 shorter. Impossible. Everyone needs to get straight on the 280AI old vs new. They are the same length to the shoulder. You can use a go guage as the no-go for both. How do you think you can fire a reg 280Rem in either and it will fire form perfect. They both have a slight crush fit. The 280Remington Improved is different. But not the old and new 280AI. The reason people think there is a difference is because the prints show a different length. But look at where on the neck it's measured too. The measurements are from 2 different spots on the shoulder. That's why one print looks like it's longer. All the 280AI rifles I have built will fire a standard 280Rem or the new Nosler brass with no problems. Think about the fact that you use the same headspace guages for both. How can there be a length difference if you cut the depth to the guage. I talked with Dave Kiff about this when I got my new Nosler spec reamer. He said they are identical and interchangable. The problem occured when Nosler took the po Ackley version to Sammi. Sammi said Nosler had to use the datum line they use not the one Ackley used. This is why one looks to be longer. It's not. An AI chamber has a . 004 shorter body than the parent cartridge all across the cartridges. That is why you can fire the parent cartridge in all of them. They should have a slight crush fit on the parent case. Your chamber is not correct because your chamber never had a crush fit to begin with and you can't ream a current chamber smaller only bigger. It needed set back and then rechambered. I don't care what guages he used it was done wrong if he didn't set it back at least</p><p> . 004 before reaming. Ackley stated to use the go as a no-go and doesn't say anything about using a field guage. It an exacting chamber design for length because of being able to safely fire factory parent cartridges in it.</p><p>Shep</p></blockquote><p></p>
[QUOTE="25WSM, post: 1924755, member: 38048"] Hayudog, I've been building 280AI rifles for 30 yrs. If your smith didn't set the barrel back any then he couldn't do a proper chamber. A 280AI original and new are set to the SAME headspace. It's . 004 shorter than the reg 280Rem. You can't have a reg 280Rem and just run the reamer in and make it . 004 shorter. Impossible. Everyone needs to get straight on the 280AI old vs new. They are the same length to the shoulder. You can use a go guage as the no-go for both. How do you think you can fire a reg 280Rem in either and it will fire form perfect. They both have a slight crush fit. The 280Remington Improved is different. But not the old and new 280AI. The reason people think there is a difference is because the prints show a different length. But look at where on the neck it's measured too. The measurements are from 2 different spots on the shoulder. That's why one print looks like it's longer. All the 280AI rifles I have built will fire a standard 280Rem or the new Nosler brass with no problems. Think about the fact that you use the same headspace guages for both. How can there be a length difference if you cut the depth to the guage. I talked with Dave Kiff about this when I got my new Nosler spec reamer. He said they are identical and interchangable. The problem occured when Nosler took the po Ackley version to Sammi. Sammi said Nosler had to use the datum line they use not the one Ackley used. This is why one looks to be longer. It's not. An AI chamber has a . 004 shorter body than the parent cartridge all across the cartridges. That is why you can fire the parent cartridge in all of them. They should have a slight crush fit on the parent case. Your chamber is not correct because your chamber never had a crush fit to begin with and you can't ream a current chamber smaller only bigger. It needed set back and then rechambered. I don't care what guages he used it was done wrong if he didn't set it back at least . 004 before reaming. Ackley stated to use the go as a no-go and doesn't say anything about using a field guage. It an exacting chamber design for length because of being able to safely fire factory parent cartridges in it. Shep [/QUOTE]
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280AI with too much head space...options?
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