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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: 940488" data-attributes="member: 24284"><p>Yawn,,,, .018" is NOT a light crush! It would take a mallet to close the bolt! .004"-.006" takes some effort. I'll go ahead and say that ammo dimensions are not the same as chamber dimensions, the ammo is just enough smaller so it will fit easily. but not be sloppy. Take even .005" off of the .018" and you're still left with .013" crush, which is an extream number. Go on down to the "GUNSMITHING" section here on LRH. There's a thread titled ".280 AI Concerns". azgutpiles' buddy is having the same troubles many are having. He had a case head seperation and, if fire forming .280 Rem. without "jamming the bullet", the case head swells. This tells me the cartridge doesn't fit the chamber as it should. To expand further, the new Nosler brass in a "Traditional" chamber (the Traditional being .014" longer) is creating an exessive headspace condition. Remember, the ammo/cases are smaller which means the excessive headspace could be .018"-.020". NOT a good situation, any way it's looked at. It is still da*#$@ funny that Nosler, themselves, recommends "jamming the bullet" (into the rifling) if handloading .280 Rem. to fire form in the SAAMI chamber.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 940488, member: 24284"] Yawn,,,, .018" is NOT a light crush! It would take a mallet to close the bolt! .004"-.006" takes some effort. I'll go ahead and say that ammo dimensions are not the same as chamber dimensions, the ammo is just enough smaller so it will fit easily. but not be sloppy. Take even .005" off of the .018" and you're still left with .013" crush, which is an extream number. Go on down to the "GUNSMITHING" section here on LRH. There's a thread titled ".280 AI Concerns". azgutpiles' buddy is having the same troubles many are having. He had a case head seperation and, if fire forming .280 Rem. without "jamming the bullet", the case head swells. This tells me the cartridge doesn't fit the chamber as it should. To expand further, the new Nosler brass in a "Traditional" chamber (the Traditional being .014" longer) is creating an exessive headspace condition. Remember, the ammo/cases are smaller which means the excessive headspace could be .018"-.020". NOT a good situation, any way it's looked at. It is still da*#$@ funny that Nosler, themselves, recommends "jamming the bullet" (into the rifling) if handloading .280 Rem. to fire form in the SAAMI chamber. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Semi Custom Kimber Montana 280AI
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