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Rifles, Reloading, Optics, Equipment
Reloading
Run-out help needed
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<blockquote data-quote="Bart B" data-source="post: 739806" data-attributes="member: 5302"><p>Lots of folks lube their case mouths before resizing the case with an expander ball on the decapping stem. As most dry lube's an abrasive (graphite?), I cringe at the though of blowing that stuff down the barrel. And what a liquid lube turns into from all the heat of powder burning may not be good for the bore. I admit some ignorance in such issues, so I choose to do things on the side of safety and bore preservation.</p><p></p><p>Before I started using gelded dies (those without balls of any kind) with neck diameters 1 or 2 thousandths smaller than a loaded round's neck diameter, I cleaned out the powder fouling inside case necks with a bore brush before tumbling or vibrating them to clean their outsides off. A bore brush size that's a tight fit in a fired case mouth does wonders getting rid of that hard powder residue that ain't slippery enough for an expander ball to come up through the tight case neck without screaching bad noises into our ears. After bore brushing case mouths and cleaning them, when lubed correctly they ended up with straighter necks on the case. Once the lube's cleaned off, then primed and charged with powder, seated bullets had less average runout than fired case with no case mouth cleaning/brushing.</p></blockquote><p></p>
[QUOTE="Bart B, post: 739806, member: 5302"] Lots of folks lube their case mouths before resizing the case with an expander ball on the decapping stem. As most dry lube's an abrasive (graphite?), I cringe at the though of blowing that stuff down the barrel. And what a liquid lube turns into from all the heat of powder burning may not be good for the bore. I admit some ignorance in such issues, so I choose to do things on the side of safety and bore preservation. Before I started using gelded dies (those without balls of any kind) with neck diameters 1 or 2 thousandths smaller than a loaded round's neck diameter, I cleaned out the powder fouling inside case necks with a bore brush before tumbling or vibrating them to clean their outsides off. A bore brush size that's a tight fit in a fired case mouth does wonders getting rid of that hard powder residue that ain't slippery enough for an expander ball to come up through the tight case neck without screaching bad noises into our ears. After bore brushing case mouths and cleaning them, when lubed correctly they ended up with straighter necks on the case. Once the lube's cleaned off, then primed and charged with powder, seated bullets had less average runout than fired case with no case mouth cleaning/brushing. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
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