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Rifles, Reloading, Optics, Equipment
Reloading
TIGHTEN PRIMER POCKETS, here's how.
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<blockquote data-quote="Pdvdh" data-source="post: 1229297" data-attributes="member: 4191"><p>A correction to my prior post:</p><p>I should have typed <strong>3/4</strong>" ball bearings. Just to set the record straight, I wanted 3/4" ball bearings. I thought the slightly larger diameter ball bearings would be less apt to flare out the mouth of the primer pockets than the smaller diameter bearings. I wanted to impact the primer pocket mouth a little more perpendicular to the sidewalls of the primer pockets. So the only size ball bearing I've is 3/4" diameter.</p><p></p><p>For .308 caliber cartridges, I went back and purchased another 4" long 5/16" fine thread Grade 8 bolt. I had to remove just a very small amount off the surface of the smooth shank of the bolt in order to clear my case necks prior to resizing the necks. The threaded 1" portion of the bolt slipped thru the fired case necks, but the solid section of the bolt shaft was just a teeny bit too large. I removed a slight skim cut from the solid shaft, just barely enough to clear the fired case necks. I did this by cutting the head off the bolt, mounting the threaded portion of the bolt in my drill press, setting the drill press to the slowest rpm speed, and holding a large file to the shank while it turned in the drill press. Then I polished it up some with emery cloth turning the bolt shaft at high speed in a battery powered drill.</p><p></p><p>Now they fit really nice down into the case mouths. Keeps the bolt in alignment with the case neck. The bolt shaft won't pass thru the case necks if I resize the case necks after firing. I have to firm up primer pockets on the fired cases prior to resizing the case necks to hold my bullets. That's how close the fit is. Works really well.</p><p></p><p>I also used a dremel diamond burr to mate the ball bearing better into the slight depression I drilled into the 1/2" thick section of steel plate I set the ball bearing on. After tightening up a few primer pockets, the areas that the ball bearing impacts against the steel plate become visually apparent. Taking a touch off the high spots of the 1/2" steel plate resulted in the ball bearing having a better mold-in fit, and jumping off the steel plate so often. Less chasing that little bugger around on the floor. I still plan to weld my 3/4" ball bearing to the 1/2" thick steel plate - next time I fire up the welder.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1229297, member: 4191"] A correction to my prior post: I should have typed [B]3/4[/B]" ball bearings. Just to set the record straight, I wanted 3/4" ball bearings. I thought the slightly larger diameter ball bearings would be less apt to flare out the mouth of the primer pockets than the smaller diameter bearings. I wanted to impact the primer pocket mouth a little more perpendicular to the sidewalls of the primer pockets. So the only size ball bearing I've is 3/4" diameter. For .308 caliber cartridges, I went back and purchased another 4" long 5/16" fine thread Grade 8 bolt. I had to remove just a very small amount off the surface of the smooth shank of the bolt in order to clear my case necks prior to resizing the necks. The threaded 1" portion of the bolt slipped thru the fired case necks, but the solid section of the bolt shaft was just a teeny bit too large. I removed a slight skim cut from the solid shaft, just barely enough to clear the fired case necks. I did this by cutting the head off the bolt, mounting the threaded portion of the bolt in my drill press, setting the drill press to the slowest rpm speed, and holding a large file to the shank while it turned in the drill press. Then I polished it up some with emery cloth turning the bolt shaft at high speed in a battery powered drill. Now they fit really nice down into the case mouths. Keeps the bolt in alignment with the case neck. The bolt shaft won't pass thru the case necks if I resize the case necks after firing. I have to firm up primer pockets on the fired cases prior to resizing the case necks to hold my bullets. That's how close the fit is. Works really well. I also used a dremel diamond burr to mate the ball bearing better into the slight depression I drilled into the 1/2" thick section of steel plate I set the ball bearing on. After tightening up a few primer pockets, the areas that the ball bearing impacts against the steel plate become visually apparent. Taking a touch off the high spots of the 1/2" steel plate resulted in the ball bearing having a better mold-in fit, and jumping off the steel plate so often. Less chasing that little bugger around on the floor. I still plan to weld my 3/4" ball bearing to the 1/2" thick steel plate - next time I fire up the welder. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
TIGHTEN PRIMER POCKETS, here's how.
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