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Rifles, Reloading, Optics, Equipment
Reloading
fire forming for the 338-Lapua-inp.
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<blockquote data-quote="Pdvdh" data-source="post: 1209672" data-attributes="member: 4191"><p>I place powder charge, cover the powder with a single layer of paper towel or toilet tissue, fill and compact with cream of wheat or corn meal to base of case neck, cover with compacted tissue to hold C-O-W / cornmeal in case; load, point in safe direction, and fire.</p><p></p><p>Removing your muzzle brake would be a good idea so the paper towel / tissue doesn't catch the muzzle brake. </p><p></p><p>The cases should blow out sufficiently on the first C-O-W firing to be formed to your chamber. You should not have to C-O-W fireform a second time, if you've generated sufficient pressure with the first C-O-W firing on the case. I would work up a load directly after the original fireforming with C-O-W. The cases will conform to the chamber more fully after you fire your first full pressure load / bullet down the bore. But the first C-O-W firing should be sufficient to get the shoulder blown out for an acceptable headspace fit of the fireformed case to your chamber.</p><p></p><p>Inspect the first C-O-W fireformed cases carefully for any splits in the shoulder area, and to see how fully the shoulder has been blown forward. If you see any splits in the shoulder (you normally won't), you'll have to anneal the shoulders before fireforming. If the shoulder doesn't 95% form, add a little powder. If you're flattening the primer excessively and getting complete shoulder formation, remove a little powder. Continue to inspect the first several C-O-W fired cases carefully for assurance your process is getting the job done safely.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1209672, member: 4191"] I place powder charge, cover the powder with a single layer of paper towel or toilet tissue, fill and compact with cream of wheat or corn meal to base of case neck, cover with compacted tissue to hold C-O-W / cornmeal in case; load, point in safe direction, and fire. Removing your muzzle brake would be a good idea so the paper towel / tissue doesn't catch the muzzle brake. The cases should blow out sufficiently on the first C-O-W firing to be formed to your chamber. You should not have to C-O-W fireform a second time, if you've generated sufficient pressure with the first C-O-W firing on the case. I would work up a load directly after the original fireforming with C-O-W. The cases will conform to the chamber more fully after you fire your first full pressure load / bullet down the bore. But the first C-O-W firing should be sufficient to get the shoulder blown out for an acceptable headspace fit of the fireformed case to your chamber. Inspect the first C-O-W fireformed cases carefully for any splits in the shoulder area, and to see how fully the shoulder has been blown forward. If you see any splits in the shoulder (you normally won't), you'll have to anneal the shoulders before fireforming. If the shoulder doesn't 95% form, add a little powder. If you're flattening the primer excessively and getting complete shoulder formation, remove a little powder. Continue to inspect the first several C-O-W fired cases carefully for assurance your process is getting the job done safely. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
fire forming for the 338-Lapua-inp.
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