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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Tight neck chamber
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<blockquote data-quote="AZShooter" data-source="post: 1094647" data-attributes="member: 5219"><p>Here is another variable when one uses a tighter than SAMMI chamber neck dimension: </p><p></p><p> Neck wall thickness has an influence on how the brass can create tension. Thinner neck walls like .010" will not have the same tension as .014" even if the same reduction of OD necessary to hold the bullet in the case. I am certain that it has an influence on ES. </p><p></p><p>The BR crowd tends to use thinner case neck walls and many of the smaller BR cases like the 6 BR come with thinner wall dimensions than our hunting magnums. Then those target shooters will use less neck tension to further lower the ES for less vertical at long range. There is no need to keep a bullet in place in the cartridge during recoil because most BR guys are single shot loading. Hunting rifles usually keep several rounds in the magazine where recoil has an influence on the bullet so having a thicker neck plus sizing with more reduction to the neck OD is necessary to keep the bullet in place.</p><p></p><p>Elkaholic reminded me that I read something similar to what he said regarding using enough neck clearance, on Accurate Shooter forum regarding the 284 win:</p><p></p><p>"Jerry Tierney, a past NBRSA 1000-yard champion and .284 Win "guru", has observed that overly tight chamber neck tolerances can cause accuracy problems. Jerry says "some guys who were running minimal neck clearance .284 chambers weren't getting the accuracy they expected. If you open up the neck to allow more clearance, say .0015-.002″ per side, that seems to solve the problems. I can't tell you exactly why–maybe it allows a 'cleaner' bullet release–but easing the neck clearance has helped many .284 shooters get better results."</p><p></p><p>I recently ordered a 284 win reamer to my specifications. Asked for a .315 neck. I have a large quantity of Winchester brass with varying thickness necks. My plan is to turn the necks down to a .013" wall thickness which makes a loaded round neck OD of .310" or a .0025" clearance per side. This it a sporter weight hunting rifle. </p><p></p><p>This is a great discussion we have had. Hope it all makes sense to you, jon 12.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1094647, member: 5219"] Here is another variable when one uses a tighter than SAMMI chamber neck dimension: Neck wall thickness has an influence on how the brass can create tension. Thinner neck walls like .010" will not have the same tension as .014" even if the same reduction of OD necessary to hold the bullet in the case. I am certain that it has an influence on ES. The BR crowd tends to use thinner case neck walls and many of the smaller BR cases like the 6 BR come with thinner wall dimensions than our hunting magnums. Then those target shooters will use less neck tension to further lower the ES for less vertical at long range. There is no need to keep a bullet in place in the cartridge during recoil because most BR guys are single shot loading. Hunting rifles usually keep several rounds in the magazine where recoil has an influence on the bullet so having a thicker neck plus sizing with more reduction to the neck OD is necessary to keep the bullet in place. Elkaholic reminded me that I read something similar to what he said regarding using enough neck clearance, on Accurate Shooter forum regarding the 284 win: "Jerry Tierney, a past NBRSA 1000-yard champion and .284 Win “guru”, has observed that overly tight chamber neck tolerances can cause accuracy problems. Jerry says “some guys who were running minimal neck clearance .284 chambers weren’t getting the accuracy they expected. If you open up the neck to allow more clearance, say .0015-.002″ per side, that seems to solve the problems. I can’t tell you exactly why–maybe it allows a ‘cleaner’ bullet release–but easing the neck clearance has helped many .284 shooters get better results.” I recently ordered a 284 win reamer to my specifications. Asked for a .315 neck. I have a large quantity of Winchester brass with varying thickness necks. My plan is to turn the necks down to a .013" wall thickness which makes a loaded round neck OD of .310" or a .0025" clearance per side. This it a sporter weight hunting rifle. This is a great discussion we have had. Hope it all makes sense to you, jon 12. [/QUOTE]
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