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Rifles, Reloading, Optics, Equipment
Reloading
Expander ball?
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<blockquote data-quote="Bart B" data-source="post: 365719" data-attributes="member: 5302"><p>I've cut a slot in the end of a 1/4th inch wood dowel and put 400 grit emery paper on it to lap out .308 Win. and .30-.338 dies. Chucking the stripped die in a lathe's headstock bottom out then wetting the paper, running it in and out a few times, using a hole micrometer to check diameter, it's worked just fine. It usually takes only a few thousandths more in neck diameter to get it right. About 1 to 3 thousandths smaller than loaded round neck diameter depending on how much grip one wants on the bullet. Be sure to clean all the grit out of your die before you start using it.</p><p></p><p>Nowadays, RCBS and Redding make full length sizing dies that even accept each others bushings so one can get one just right for your case neck's wall thickness and bullet diameter. Coupled with a Redding shell holder of the right height so your fired case shoulders are set back exactly 1 thousandth when the loaded die bottoms out on it and you've got all the right stuff.</p><p></p><p>Full length sizing cases in such a die makes for much straighter necks. It's important to minimally size fired case bodies. No more than 2 or 3 thousandths reduction in diameter is about right. If you chambers are on the big side, you can get your die's body lapped out or send a few fired cases to folks that make them for you.</p></blockquote><p></p>
[QUOTE="Bart B, post: 365719, member: 5302"] I've cut a slot in the end of a 1/4th inch wood dowel and put 400 grit emery paper on it to lap out .308 Win. and .30-.338 dies. Chucking the stripped die in a lathe's headstock bottom out then wetting the paper, running it in and out a few times, using a hole micrometer to check diameter, it's worked just fine. It usually takes only a few thousandths more in neck diameter to get it right. About 1 to 3 thousandths smaller than loaded round neck diameter depending on how much grip one wants on the bullet. Be sure to clean all the grit out of your die before you start using it. Nowadays, RCBS and Redding make full length sizing dies that even accept each others bushings so one can get one just right for your case neck's wall thickness and bullet diameter. Coupled with a Redding shell holder of the right height so your fired case shoulders are set back exactly 1 thousandth when the loaded die bottoms out on it and you've got all the right stuff. Full length sizing cases in such a die makes for much straighter necks. It's important to minimally size fired case bodies. No more than 2 or 3 thousandths reduction in diameter is about right. If you chambers are on the big side, you can get your die's body lapped out or send a few fired cases to folks that make them for you. [/QUOTE]
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Expander ball?
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