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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel throating pros & cons
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<blockquote data-quote="NesikaChad" data-source="post: 415886" data-attributes="member: 7449"><p>In my shop I try to stick to what I call the "girlfriend or wife" doctrine.</p><p></p><p>What that means is only one particular hard cylindrical object ever enters the hole. . . I don't care to stack reamer upon reamer as in my head it just invites the potential for more TIR (total indicated runout) If a cst wants a "X" cartridge with a "Y" bullet and I don't have a reamer made for the COAL I order one up.</p><p></p><p>That being said I know of many who chase chambers with a throating reamer and the guns shoot just fine. They shoot quite well in fact.</p><p></p><p>It's a quirky thing for me.</p><p></p><p></p><p>Essentially the primary purpose for doing this is typically so that a chamber can accept heavier (longer) bullets without having a portion of the case swallowing up the bullet in order for the thing to chamber. If your gun was chambered/throated for 40 grain bullets and you suddenly decide you want to shoot an 80 grain Sierra your probably going to discover that a good portion of the bullet is going to be squished down inside the neck. Throating the chamber will allow you to seat the bullet out further to take advantage of case capacity.</p><p></p><p></p><p>It can also be used to breath a little more life in a barrel that's destined for the old folks home. My best friend David Karcher's National Championship win in 2002 at Perry was done on a barrel with over 7500 rounds through it. Every time it opens up at the 600, we just chase it with a reamer and it comes back. (for awhile) He's since decided to have a new tube installed. When the throat starts to look like a dry lake bed you just chase it out a little and then seat your bullets out a little further. In some cases you'll find that you don't even have to do that. More freebore doesn't always make the gun fussy about seating depth.</p><p></p><p>Hope this helped.</p><p></p><p>C</p></blockquote><p></p>
[QUOTE="NesikaChad, post: 415886, member: 7449"] In my shop I try to stick to what I call the "girlfriend or wife" doctrine. What that means is only one particular hard cylindrical object ever enters the hole. . . I don't care to stack reamer upon reamer as in my head it just invites the potential for more TIR (total indicated runout) If a cst wants a "X" cartridge with a "Y" bullet and I don't have a reamer made for the COAL I order one up. That being said I know of many who chase chambers with a throating reamer and the guns shoot just fine. They shoot quite well in fact. It's a quirky thing for me. Essentially the primary purpose for doing this is typically so that a chamber can accept heavier (longer) bullets without having a portion of the case swallowing up the bullet in order for the thing to chamber. If your gun was chambered/throated for 40 grain bullets and you suddenly decide you want to shoot an 80 grain Sierra your probably going to discover that a good portion of the bullet is going to be squished down inside the neck. Throating the chamber will allow you to seat the bullet out further to take advantage of case capacity. It can also be used to breath a little more life in a barrel that's destined for the old folks home. My best friend David Karcher's National Championship win in 2002 at Perry was done on a barrel with over 7500 rounds through it. Every time it opens up at the 600, we just chase it with a reamer and it comes back. (for awhile) He's since decided to have a new tube installed. When the throat starts to look like a dry lake bed you just chase it out a little and then seat your bullets out a little further. In some cases you'll find that you don't even have to do that. More freebore doesn't always make the gun fussy about seating depth. Hope this helped. C [/QUOTE]
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