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<blockquote data-quote="Alibiiv" data-source="post: 1571429" data-attributes="member: 69192"><p>Just curious about which .280 Ackley Improved that you have? Is it the SAAMI, Nosler .280Ai or is it the .280 Ackley Improved (Wildcat, 40 degree)? There's like a .014 thousandths difference between the two cartridges. I encountered this dilemma as many others have when discussing this caliber and their differences. Do you have the proper dies for your rifle's particular caliber; SAAMI chamber or Wildcat 40 degree caliber? I am not sure about if this kind of a mismatch will cause your problems, however I believe that it is worth checking in to. You might want to ask the gunsmith, <u><em><strong>who made the build</strong></em></u>, if "he knows" what chamber and headspace gauges he used to make the build. The .280 Ackley Improved (Nosler), or is the rifle chambered for the original .280 Ackley Improved, 40 degree chamber.</p><p></p><p>If your rifle build has the original .280 Ackley Improved, Wildcat 40 degree, your chamber is done with the same reamer, only the chamber is drilled .014 thousandths deeper than the .280 AI SAAMI. If you have a set of SAAMI dies they are going to size your brass, including the shoulder, .014 thousandths shorter than the original .280AI Wildcat 40 degree shoulder. With that said,<strong><em> and</em></strong> <u><em><strong>"if"</strong></em></u> you have the .280 AI Wildcat, 40 degree chamber in your rifle and you are using the original,<em> .280 Ackley Improve SAAMI dies, your brass is going to be too short by .014 thousands</em>, this includes the datum point from the base to the shoulder of your brass. If there's enough firing pin protrusion, you could still be getting some rounds to go off, which could be causing the sporadic discharges of your rifle. IMHO. Whew I hope that I wrote this properly and that this all makes sense to you. If someone else would like to chime in on this post it would be helpful also.</p></blockquote><p></p>
[QUOTE="Alibiiv, post: 1571429, member: 69192"] Just curious about which .280 Ackley Improved that you have? Is it the SAAMI, Nosler .280Ai or is it the .280 Ackley Improved (Wildcat, 40 degree)? There's like a .014 thousandths difference between the two cartridges. I encountered this dilemma as many others have when discussing this caliber and their differences. Do you have the proper dies for your rifle's particular caliber; SAAMI chamber or Wildcat 40 degree caliber? I am not sure about if this kind of a mismatch will cause your problems, however I believe that it is worth checking in to. You might want to ask the gunsmith, [U][I][B]who made the build[/B][/I][/U], if "he knows" what chamber and headspace gauges he used to make the build. The .280 Ackley Improved (Nosler), or is the rifle chambered for the original .280 Ackley Improved, 40 degree chamber. If your rifle build has the original .280 Ackley Improved, Wildcat 40 degree, your chamber is done with the same reamer, only the chamber is drilled .014 thousandths deeper than the .280 AI SAAMI. If you have a set of SAAMI dies they are going to size your brass, including the shoulder, .014 thousandths shorter than the original .280AI Wildcat 40 degree shoulder. With that said,[B][I] and[/I][/B] [U][I][B]"if"[/B][/I][/U] you have the .280 AI Wildcat, 40 degree chamber in your rifle and you are using the original,[I] .280 Ackley Improve SAAMI dies, your brass is going to be too short by .014 thousands[/I], this includes the datum point from the base to the shoulder of your brass. If there's enough firing pin protrusion, you could still be getting some rounds to go off, which could be causing the sporadic discharges of your rifle. IMHO. Whew I hope that I wrote this properly and that this all makes sense to you. If someone else would like to chime in on this post it would be helpful also. [/QUOTE]
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