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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
The .338 Rogue
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<blockquote data-quote="Pdvdh" data-source="post: 1213870" data-attributes="member: 4191"><p>Another tip for those fireforming cases using C-O-W or bullets jammed into the lands. </p><p></p><p>Place a thin layer of Hornady Unique resizing lubricant on the exterior of the cartridge casing forward of the belt area, all the way up to the forward lip of the case necks. This will help prevent any Cream of Wheat from baking to the exterior of the case neck. I think it will also help to reduce case head stretching should the case head not be perfectly held in contact with the bolt face during fireforming.</p><p></p><p>Case head stretching occurs when the body of the casing grips the sidewalls of the rifle chamber while the case head isn't held intact against the bolt face. The case sidewall first gets blown firmly against the chamber sidewalls, essentially glued to the chamber under high pressure expansion. Then as case pressure continues to build, the case head gets driven back into the bolt face while stretching away from the case sidewalls (which can't move backwards toward the bolt face). Lubing the the sidewalls of your cases forward of the expansion ring that forms just forward of the case head should weaken the bond between the sidewall of the case and the chamber, allowing the case sidewall to shift rearward with the case head, perhaps reducing case head stretch. If the sidewalls of the casing can slip back against the bolt face with the case head as pressure builds, then the shoulder is more apt to blow forward, rather than the case head stretching rearward away from the body of the brass casing. I haven't done anything to prove this, so don't hold my feet to the fire. But the theory of operation is completely sound. And it doesn't take long to add this lubing step. So it's now a SOP (standard operating procedure) in my fireforming routine.</p><p></p><p>I started out lubing only the exterior of the case necks with Hornady Unique to eliminate cooked Cream of Wheat bonding to the exterior of the case necks while fireforming. Worked very good for that purpose. And as I thought about the benefits, I began lubing the entire body of the cases with Unique resizing lube also. </p><p></p><p>Imperial resizing lube should work also, but I prefer Hornady Unique, because it applies more easily in a thinner coating, and it removes more easily also.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1213870, member: 4191"] Another tip for those fireforming cases using C-O-W or bullets jammed into the lands. Place a thin layer of Hornady Unique resizing lubricant on the exterior of the cartridge casing forward of the belt area, all the way up to the forward lip of the case necks. This will help prevent any Cream of Wheat from baking to the exterior of the case neck. I think it will also help to reduce case head stretching should the case head not be perfectly held in contact with the bolt face during fireforming. Case head stretching occurs when the body of the casing grips the sidewalls of the rifle chamber while the case head isn't held intact against the bolt face. The case sidewall first gets blown firmly against the chamber sidewalls, essentially glued to the chamber under high pressure expansion. Then as case pressure continues to build, the case head gets driven back into the bolt face while stretching away from the case sidewalls (which can't move backwards toward the bolt face). Lubing the the sidewalls of your cases forward of the expansion ring that forms just forward of the case head should weaken the bond between the sidewall of the case and the chamber, allowing the case sidewall to shift rearward with the case head, perhaps reducing case head stretch. If the sidewalls of the casing can slip back against the bolt face with the case head as pressure builds, then the shoulder is more apt to blow forward, rather than the case head stretching rearward away from the body of the brass casing. I haven't done anything to prove this, so don't hold my feet to the fire. But the theory of operation is completely sound. And it doesn't take long to add this lubing step. So it's now a SOP (standard operating procedure) in my fireforming routine. I started out lubing only the exterior of the case necks with Hornady Unique to eliminate cooked Cream of Wheat bonding to the exterior of the case necks while fireforming. Worked very good for that purpose. And as I thought about the benefits, I began lubing the entire body of the cases with Unique resizing lube also. Imperial resizing lube should work also, but I prefer Hornady Unique, because it applies more easily in a thinner coating, and it removes more easily also. [/QUOTE]
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The .338 Rogue
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