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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Custom throat?
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<blockquote data-quote="Garycrow" data-source="post: 1275255" data-attributes="member: 30743"><p>I send a dummy round with my chosen bullet seated as you describe, with the top of the boattail at the neck shoulder junction. I tell the gunsmith to throat it to touch the lands at that length, this allows for throat wear so I still have room to seat the bullet out farther as it lengthens. I prefer to err on the too short side, a gunsmith can always lengthen the throat with a throating reamer but he can't put metal back. Most SAAMI chambers have the throat too long so it's tough to touch the lands and still have full neck contact, or they won't fit in the magazine. It's especially critical to pay attention to throating if you plan on shooting VLD's, they often have different requirements than other bullets. I've even gone so far as to have my own reamer made with the correct freebore for the bullet I wanted to shoot. Most good gunsmiths will have a reamer with relatively short freebore and finish the throat with a throating reamer so they can custom throat it. In any case I always want to be able to touch the lands with nearly full bullet to neck contact. Some will tell you that their rifles shoot great with a jump, but I haven't always found that to be the case and it limits your options if the throat is too long. </p><p></p><p>It's a custom rifle, the whole point of custom is to get something you can't get off the shelf.</p></blockquote><p></p>
[QUOTE="Garycrow, post: 1275255, member: 30743"] I send a dummy round with my chosen bullet seated as you describe, with the top of the boattail at the neck shoulder junction. I tell the gunsmith to throat it to touch the lands at that length, this allows for throat wear so I still have room to seat the bullet out farther as it lengthens. I prefer to err on the too short side, a gunsmith can always lengthen the throat with a throating reamer but he can't put metal back. Most SAAMI chambers have the throat too long so it's tough to touch the lands and still have full neck contact, or they won't fit in the magazine. It's especially critical to pay attention to throating if you plan on shooting VLD's, they often have different requirements than other bullets. I've even gone so far as to have my own reamer made with the correct freebore for the bullet I wanted to shoot. Most good gunsmiths will have a reamer with relatively short freebore and finish the throat with a throating reamer so they can custom throat it. In any case I always want to be able to touch the lands with nearly full bullet to neck contact. Some will tell you that their rifles shoot great with a jump, but I haven't always found that to be the case and it limits your options if the throat is too long. It's a custom rifle, the whole point of custom is to get something you can't get off the shelf. [/QUOTE]
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Custom throat?
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