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Rifles, Reloading, Optics, Equipment
Reloading
Fire forming help
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<blockquote data-quote="shortgrass" data-source="post: 1492324" data-attributes="member: 24284"><p>If your chamber is properly head spaced for the Ackley Improved, you need to be necking down new .270 Win brass . Start by running your 'lot' of .270 brass so that the neck is sized half way down its length using your 6.5mm sizing die. Next, adjust the sizing die so that when your sized case gives resistance to closing the bolt. There, you have the cartridge case "trapped" between the bolt face and the neck/shoulder junction of the chamber. Next, load a couple or three your prepared case with a moderate charge for the bullet listed in a loading manual. <strong>Measure the neck diameter of those loaded cartridges.</strong> You need a minimum of .003" clearance here, the neck diameter being at least .003" smaller than the neck in the chamber. There is no need to 'jam' the bullet if your cases are properly sized. It takes chamber pressure to fire form brass, and with the COW method it will take more than one firing to fully fire form the brass. Why isn't the gunsmith that chambered this barrel for you not helping you with fire forming brass if you are unfamiliar with the process?<strong> IF</strong> the chamber is properly head spaced there is no need to "jam" the bullet or oil cases. Oiling the cases can create dangerous conditions up to an including catastrophic failure of the rifle. A very good reference for Ackley head spacing can be found on <a href="https://mansonreamers.com" target="_blank">https://mansonreamers.com</a></p></blockquote><p></p>
[QUOTE="shortgrass, post: 1492324, member: 24284"] If your chamber is properly head spaced for the Ackley Improved, you need to be necking down new .270 Win brass . Start by running your 'lot' of .270 brass so that the neck is sized half way down its length using your 6.5mm sizing die. Next, adjust the sizing die so that when your sized case gives resistance to closing the bolt. There, you have the cartridge case "trapped" between the bolt face and the neck/shoulder junction of the chamber. Next, load a couple or three your prepared case with a moderate charge for the bullet listed in a loading manual. [B]Measure the neck diameter of those loaded cartridges.[/B] You need a minimum of .003" clearance here, the neck diameter being at least .003" smaller than the neck in the chamber. There is no need to 'jam' the bullet if your cases are properly sized. It takes chamber pressure to fire form brass, and with the COW method it will take more than one firing to fully fire form the brass. Why isn't the gunsmith that chambered this barrel for you not helping you with fire forming brass if you are unfamiliar with the process?[B] IF[/B] the chamber is properly head spaced there is no need to "jam" the bullet or oil cases. Oiling the cases can create dangerous conditions up to an including catastrophic failure of the rifle. A very good reference for Ackley head spacing can be found on [URL]https://mansonreamers.com[/URL] [/QUOTE]
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