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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrelling- Tight Necks
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<blockquote data-quote="Fiftydriver" data-source="post: 60633" data-attributes="member: 10"><p>Zane,</p><p></p><p>I like to tell my customers that for the tight neck chambers I cut for them, they need a MINUMUM of 0.0015" total clearance between the bullet and neck upon firing. That means 0.00075" on all sides.</p><p></p><p>This is as close as I feel is safe. A better clearance dimension is 0.002" total as you list which allows 0.001" clearance on both sides.</p><p></p><p>This just gives you a bit more safetly margin especially if you are using a high intensity round.</p><p></p><p>Tight necks are great for accuracy but perhaps even more important is a properly designed leade and throat. A tight throat will aid accuracy more then a tight neck from what I have seen. In my Varmint, target and V-Block rifles I will cut the throat to a very tight 0.0003" over the bullet diameter my customer wants to use. This is important as same caliber bullets from different manufacturers can vary up to 0.001" in diameter so 0.0003" over one bullet diameter may be significantly different then to another bullet diameter.</p><p></p><p>If my customs want to be able to shoot any bullet they want, I will go 0.0005" to 0.0006" over nominal bullet diameter.</p><p></p><p>As long as the neck run outs and bullet run outs are in the 0.001" range or less, and your throat is tight and straight, you will get match grade accuracy.</p><p></p><p>With a properly built rifle, your accuracy goals are well within reach.</p><p></p><p>Good Shooting!!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 60633, member: 10"] Zane, I like to tell my customers that for the tight neck chambers I cut for them, they need a MINUMUM of 0.0015" total clearance between the bullet and neck upon firing. That means 0.00075" on all sides. This is as close as I feel is safe. A better clearance dimension is 0.002" total as you list which allows 0.001" clearance on both sides. This just gives you a bit more safetly margin especially if you are using a high intensity round. Tight necks are great for accuracy but perhaps even more important is a properly designed leade and throat. A tight throat will aid accuracy more then a tight neck from what I have seen. In my Varmint, target and V-Block rifles I will cut the throat to a very tight 0.0003" over the bullet diameter my customer wants to use. This is important as same caliber bullets from different manufacturers can vary up to 0.001" in diameter so 0.0003" over one bullet diameter may be significantly different then to another bullet diameter. If my customs want to be able to shoot any bullet they want, I will go 0.0005" to 0.0006" over nominal bullet diameter. As long as the neck run outs and bullet run outs are in the 0.001" range or less, and your throat is tight and straight, you will get match grade accuracy. With a properly built rifle, your accuracy goals are well within reach. Good Shooting!!! Kirby Allen(50) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Barrelling- Tight Necks
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