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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: 940217" data-attributes="member: 24284"><p>If you'll go to the SAAMI web site it clearly shows that the minimum headspace dimension for the <strong>.280 Rem. </strong>is <strong>2.100"</strong> and the minimum headspace dimension for the <strong>Nosler .280 A.I. </strong>is <strong>2.140"</strong>, the .280 Rem. being <strong>.040" shorter</strong>. The .014" you're speaking of is the difference between the <strong>Traditional Ackley</strong> and the <strong>Nosler Version,</strong> which has absolutely no bearing on fire forming .280 Rem. to the Nosler A.I. chamber. Headspace, on these rimless cartridges is measured from the bolt face to the datum line on the shoulder of the chamber (the datum line is where the diameter of the shoulder measures .375"). The .280 Rem. cannot contact the Nosler chamber or the Traditional Ackley chamber at that point because the diameter of the Nosler chamber is bigger and the shoulder angle is different than the .280 Rem. That makes all this comparison of headspace dimensions irrelevant. The important thing is, does the .280 Rem. have a 'crushed fit' in the Nosler chamber like it does in a Traditional Ackley chamber(that is reamed to the proper depth)? My experience with the Nosler .280 A.I. is that factory loaded or hand loaded ammo (to the OAL specs in the loading manual for the bullet being used) does not 'crush fit'. If using hand loads, the bullet must be seated 'long', jammed into the rifling. This insures that the round being fire formed will be firmly against the bolt face and will do all of its 'stretching' at the forward end of the case, not at the head end. The current Nosler Reloading Manual clearly states that to fireform .280 Rem. in the Nosler .280 A.I. chamber that the bullet should be 'jammed' into the rifling. When fire forming .280 Rem. in a Traditional Ackley chamber the .280 rd. has a 'crush' fit between the junction of the neck/shoulder and the bolt face.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 940217, member: 24284"] If you'll go to the SAAMI web site it clearly shows that the minimum headspace dimension for the [B].280 Rem. [/B]is [B]2.100"[/B] and the minimum headspace dimension for the [B]Nosler .280 A.I. [/B]is [B]2.140"[/B], the .280 Rem. being [B].040" shorter[/B]. The .014" you're speaking of is the difference between the [B]Traditional Ackley[/B] and the [B]Nosler Version,[/B] which has absolutely no bearing on fire forming .280 Rem. to the Nosler A.I. chamber. Headspace, on these rimless cartridges is measured from the bolt face to the datum line on the shoulder of the chamber (the datum line is where the diameter of the shoulder measures .375"). The .280 Rem. cannot contact the Nosler chamber or the Traditional Ackley chamber at that point because the diameter of the Nosler chamber is bigger and the shoulder angle is different than the .280 Rem. That makes all this comparison of headspace dimensions irrelevant. The important thing is, does the .280 Rem. have a 'crushed fit' in the Nosler chamber like it does in a Traditional Ackley chamber(that is reamed to the proper depth)? My experience with the Nosler .280 A.I. is that factory loaded or hand loaded ammo (to the OAL specs in the loading manual for the bullet being used) does not 'crush fit'. If using hand loads, the bullet must be seated 'long', jammed into the rifling. This insures that the round being fire formed will be firmly against the bolt face and will do all of its 'stretching' at the forward end of the case, not at the head end. The current Nosler Reloading Manual clearly states that to fireform .280 Rem. in the Nosler .280 A.I. chamber that the bullet should be 'jammed' into the rifling. When fire forming .280 Rem. in a Traditional Ackley chamber the .280 rd. has a 'crush' fit between the junction of the neck/shoulder and the bolt face. [/QUOTE]
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Semi Custom Kimber Montana 280AI
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