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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Semi Custom Kimber Montana 280AI
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<blockquote data-quote="shortgrass" data-source="post: 939972" data-attributes="member: 24284"><p>You can run the numbers all you'd like, but the shape of the cases is what's making the difference. I have the last rifle I built under my 07 Manufactures license (I have a 01, now) in my shop and use it as a "display model". It's chambered in .280 Nosler AI. I stripped the bolt of the ejector and firing pin assembly (Rem. 700 LA) and dropped the "GO" gauge into the chamber. I could slightly 'feel' the gauge as I closed the bolt. Then I dropped the "NO-GO" Nosler gauge in. The bolt wouldn't even think about closing. Next, I dropped the .280 Rem. "GO" gauge in, the bolt closed without any resistance. I then inserted the .280 Rem. NO-GO gauge and I could 'feel' the gauge , ever so slightly, as I closed the bolt. I have some new Winchester brand .280 Rem. brass in the shop, so I tried a couple of those. Bolt closed without resistance. I have some new, factory loaded, Remington brand .280. Rem. ammo on the shelf, so I tried a couple of those. The bolt closed without resistance. I, also, have several boxes of new, Nolsler brand, .280 Nosler AI cases, so I got into an open box and tried a couple of those. The bolt closed without any resistance. My reamer and gauges are all clearly marked, so I didn't mis-read anything. I've done this a half dozen times to assure myself that "I'm not seeing things that aren't there". On average, I cut 75-80 chambers, on a professional basis, yearly, and I've been chambering since 1992. Put a 'parent' case/ammo in an Ackley chamber and close the bolt on it, without having any resistance and you are creating an excessive headspace condition. To learn more about the Original Ackley rounds, I'd suggest reading "Handbook for Shooters & Reloaders", volumes one and two, by P.O. Ackley.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 939972, member: 24284"] You can run the numbers all you'd like, but the shape of the cases is what's making the difference. I have the last rifle I built under my 07 Manufactures license (I have a 01, now) in my shop and use it as a "display model". It's chambered in .280 Nosler AI. I stripped the bolt of the ejector and firing pin assembly (Rem. 700 LA) and dropped the "GO" gauge into the chamber. I could slightly 'feel' the gauge as I closed the bolt. Then I dropped the "NO-GO" Nosler gauge in. The bolt wouldn't even think about closing. Next, I dropped the .280 Rem. "GO" gauge in, the bolt closed without any resistance. I then inserted the .280 Rem. NO-GO gauge and I could 'feel' the gauge , ever so slightly, as I closed the bolt. I have some new Winchester brand .280 Rem. brass in the shop, so I tried a couple of those. Bolt closed without resistance. I have some new, factory loaded, Remington brand .280. Rem. ammo on the shelf, so I tried a couple of those. The bolt closed without resistance. I, also, have several boxes of new, Nolsler brand, .280 Nosler AI cases, so I got into an open box and tried a couple of those. The bolt closed without any resistance. My reamer and gauges are all clearly marked, so I didn't mis-read anything. I've done this a half dozen times to assure myself that "I'm not seeing things that aren't there". On average, I cut 75-80 chambers, on a professional basis, yearly, and I've been chambering since 1992. Put a 'parent' case/ammo in an Ackley chamber and close the bolt on it, without having any resistance and you are creating an excessive headspace condition. To learn more about the Original Ackley rounds, I'd suggest reading "Handbook for Shooters & Reloaders", volumes one and two, by P.O. Ackley. [/QUOTE]
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Semi Custom Kimber Montana 280AI
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