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Rifles, Reloading, Optics, Equipment
Gunsmithing
Questions about reamers
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<blockquote data-quote="shortgrass" data-source="post: 1348509" data-attributes="member: 24284"><p>If you will go to the SAAMI web site, you will find drawings of cartridges and chambers. Industry standards. You can see the free bore in the cartridge drawing. The free bore is the cylindrical section that lies between the end of the chamber where the brass sits and the throat, which is the "funnel" at the beginning of the rifling. The very best way to establish your 'custom' free bore is to send 2 dummy rounds to your reamer maker (Dave Manson or JGS). Include a note telling him you want the bullet to touch the rifling using your dummys. From there, you can set up your reloads to be .005-.020" or wherever the best accuracy is. There are no hard and fast rules. The only rule there is, is that the throat will wear with every fired bullet that crosses it!</p></blockquote><p></p>
[QUOTE="shortgrass, post: 1348509, member: 24284"] If you will go to the SAAMI web site, you will find drawings of cartridges and chambers. Industry standards. You can see the free bore in the cartridge drawing. The free bore is the cylindrical section that lies between the end of the chamber where the brass sits and the throat, which is the "funnel" at the beginning of the rifling. The very best way to establish your 'custom' free bore is to send 2 dummy rounds to your reamer maker (Dave Manson or JGS). Include a note telling him you want the bullet to touch the rifling using your dummys. From there, you can set up your reloads to be .005-.020" or wherever the best accuracy is. There are no hard and fast rules. The only rule there is, is that the throat will wear with every fired bullet that crosses it! [/QUOTE]
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