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Rifles, Reloading, Optics, Equipment
Reloading
problem resizing for head space.
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<blockquote data-quote="Bullet bumper" data-source="post: 705692" data-attributes="member: 17844"><p>If it's an old fashioned full length die with an expander ball then yes that can happen. If you are not cleaning and lubricating the inside of the neck well then the friction of the expander ball coming out can draw the shoulder out a few thou.</p><p>Clean up inside the necks with an old worn bore brush wrapped with a small amount of steel wool. Chuck it in a battery operated screw driver .</p><p>Then buy some moly powder and fine graphite and mix together at 50 50 ratio.</p><p>With the case clean inside the neck and outside of the case run your fingers around the case neck to put some body grease on the case neck then dunk the necks into the powder . Tap the case to removes excess but not so hard that you nock it all off .</p><p>Then roll on your sizing lube onto the body off the case.</p><p>Size the case a bit at a time adjusting teh die down in small amounts until it will chamber with just some resistance on the bolt then turn the die down 1/32 of a turn more and size again. The bolt should then close easy and you have minimum headspace or fairly tight headspace . On a 7/8 x 14 threaded die , 1/32 of a turn = about .002 movement .</p><p>1/16 of a turn = about .0045 movement.</p><p>For comparison only the full headspace tolerance for a 308W is about .008 , 1/8 of a turn is .0089 so you see how easy it is to size too much by screwing the die down too greater amount when the case is close to the correct fit .</p><p>In a bolt action you want the case to fit back in the the minmum amount of headspace but in a lever or auto it may be better to add a few extra thou to aid reliable operation.</p></blockquote><p></p>
[QUOTE="Bullet bumper, post: 705692, member: 17844"] If it's an old fashioned full length die with an expander ball then yes that can happen. If you are not cleaning and lubricating the inside of the neck well then the friction of the expander ball coming out can draw the shoulder out a few thou. Clean up inside the necks with an old worn bore brush wrapped with a small amount of steel wool. Chuck it in a battery operated screw driver . Then buy some moly powder and fine graphite and mix together at 50 50 ratio. With the case clean inside the neck and outside of the case run your fingers around the case neck to put some body grease on the case neck then dunk the necks into the powder . Tap the case to removes excess but not so hard that you nock it all off . Then roll on your sizing lube onto the body off the case. Size the case a bit at a time adjusting teh die down in small amounts until it will chamber with just some resistance on the bolt then turn the die down 1/32 of a turn more and size again. The bolt should then close easy and you have minimum headspace or fairly tight headspace . On a 7/8 x 14 threaded die , 1/32 of a turn = about .002 movement . 1/16 of a turn = about .0045 movement. For comparison only the full headspace tolerance for a 308W is about .008 , 1/8 of a turn is .0089 so you see how easy it is to size too much by screwing the die down too greater amount when the case is close to the correct fit . In a bolt action you want the case to fit back in the the minmum amount of headspace but in a lever or auto it may be better to add a few extra thou to aid reliable operation. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
problem resizing for head space.
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