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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="arch408" data-source="post: 1925318" data-attributes="member: 59036"><p>First, why did you mess with a gun that shot 1/2 groups?!!!!!!!! Ackley designed his improved head spaces to be less than factory specs. I believe they were .0001 inch. So a factory barrel needs to be set back to accomplish that. That was make sure that factory brass would would have an interference fit so the brass could be fire formed. It sounds like the barrel was not set back or the reamer run in too far. Ackley used the go gauge as the no-go gauge to set the head space. lMO, you have three choices. One, have the barrel set back, or maybe surface grind the recoil lug to set the headspace if it's thick enough. I've done this. Two which is what I would do; rechamber to the .280 Gibbs which would increase the powder capacity which would give you a pretty good velocity increase. Three, neck out the cases to 30 caliber and than neck them back down to .284 adjusting your die until the cases would chamber with a slight bolt resistance (which is the way the original case should have been) and then fire form. On subsequent resizing, adjust the die so it barely allows the cases to chamber. (Shade tree mechanicing, but it might work.) Definately my last choice. </p><p>P.S. If you are going to trash the barrel, send it to me, I'll pay for shipping and I'll give it a good home. It's obviously a good barrel.</p></blockquote><p></p>
[QUOTE="arch408, post: 1925318, member: 59036"] First, why did you mess with a gun that shot 1/2 groups?!!!!!!!! Ackley designed his improved head spaces to be less than factory specs. I believe they were .0001 inch. So a factory barrel needs to be set back to accomplish that. That was make sure that factory brass would would have an interference fit so the brass could be fire formed. It sounds like the barrel was not set back or the reamer run in too far. Ackley used the go gauge as the no-go gauge to set the head space. lMO, you have three choices. One, have the barrel set back, or maybe surface grind the recoil lug to set the headspace if it's thick enough. I've done this. Two which is what I would do; rechamber to the .280 Gibbs which would increase the powder capacity which would give you a pretty good velocity increase. Three, neck out the cases to 30 caliber and than neck them back down to .284 adjusting your die until the cases would chamber with a slight bolt resistance (which is the way the original case should have been) and then fire form. On subsequent resizing, adjust the die so it barely allows the cases to chamber. (Shade tree mechanicing, but it might work.) Definately my last choice. P.S. If you are going to trash the barrel, send it to me, I'll pay for shipping and I'll give it a good home. It's obviously a good barrel. [/QUOTE]
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280AI with too much head space...options?
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