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<blockquote data-quote="25WSM" data-source="post: 1573595" data-attributes="member: 38048"><p>On an ackley improved you are supposed to make the chamber .003 thou shorter than the parent case. This will jam the parent case snug enough to fire and not stretch the case. If you are having a factory barrel turned into an ai most gunsmith will leave the factory chamber alone and ream to the ai. They do this so they don't have to set the barrel back. This is lazy gunsmithing. You should always set the barrel back and make the ackley chamber .003 short. You use the go guage as the no go guage and your good. I have fixed many done the lazy way. If you are only going to reload for the rifle and will not fire factory ammo it is ok to do the lazy way. But you will need to create a false shoulder and jam bullets to get perfect brass. Then you just set them back 1 to 2 thou when you size the brass for the reloads. That is the ins and outs of the ackley. If you have an 06 based ackley that is not a 280 you can use 280 brass and size them to your chamber because they are already long and will give you a solid shoulder. I've been building them for over 30 yrs and have had zero issues with ai chambers. By the way the nosler is a true 280 ackley. It's a regular 280 pushed back .003 and they work in any true 280 ackley. I use them in my 280ai 1k rifle. The numbers on the print look confusing til you realize they measure them from a different spot on the print. The nosler 280ai is the PO ackley. I can fire a factory round in my 280ai and measure it to a nosler brass and they are the same. So is the hornady 280ai brass. Shep</p></blockquote><p></p>
[QUOTE="25WSM, post: 1573595, member: 38048"] On an ackley improved you are supposed to make the chamber .003 thou shorter than the parent case. This will jam the parent case snug enough to fire and not stretch the case. If you are having a factory barrel turned into an ai most gunsmith will leave the factory chamber alone and ream to the ai. They do this so they don't have to set the barrel back. This is lazy gunsmithing. You should always set the barrel back and make the ackley chamber .003 short. You use the go guage as the no go guage and your good. I have fixed many done the lazy way. If you are only going to reload for the rifle and will not fire factory ammo it is ok to do the lazy way. But you will need to create a false shoulder and jam bullets to get perfect brass. Then you just set them back 1 to 2 thou when you size the brass for the reloads. That is the ins and outs of the ackley. If you have an 06 based ackley that is not a 280 you can use 280 brass and size them to your chamber because they are already long and will give you a solid shoulder. I've been building them for over 30 yrs and have had zero issues with ai chambers. By the way the nosler is a true 280 ackley. It's a regular 280 pushed back .003 and they work in any true 280 ackley. I use them in my 280ai 1k rifle. The numbers on the print look confusing til you realize they measure them from a different spot on the print. The nosler 280ai is the PO ackley. I can fire a factory round in my 280ai and measure it to a nosler brass and they are the same. So is the hornady 280ai brass. Shep [/QUOTE]
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