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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: 1094719" data-attributes="member: 5219"><p>I will make a note so I can let you know Rich. I won't be installing and chambering that 284 for a while.</p><p></p><p> My 7mm/375 Ruger has .0035" per side with .002" neck tension. </p><p></p><p>The beauty of either of these 7mms is that I could adjust the neck turning tool to skim off .0005" -.001 per side with ease to change the fit. </p><p></p><p>-----------------------------</p><p></p><p>FYI on Accurate shooter in the 7mm info page, they suggest that .003"-.004" is best for the 7 WSM.</p><p>quote:</p><p>"WSM cases need adequate neck clearance in the chamber for bullet release. Total Clearance of .003″-.004″ (both sides combined) will probably better than .0015″ or less."</p><p></p><p>Also....quote:</p><p></p><p>"Producing Better WSM Ammo</p><p> Here are some advanced reloading tips gathered from successful 7mm WSM shooters.</p><p></p><p>1. Turn the necks, particularly with Winchester brass. This will help with neck-wall uniformity and bullet release. WSM cases need adequate neck clearance in the chamber for bullet release. Total Clearance of .003″-.004″ (both sides combined) will probably better than .0015″ or less.</p><p></p><p>2. Make sure you have sufficient clearance between the neck and the side of the chamber. Some guys running with super-tight clearance on the necks had persistant and frustrating accuracy problems and unexplained flyers. Adding neck clearance (by turning the necks) cured the flyers. Three or four thousandths total clearance (sum of both sides) will probably work better than one-thousandth.</p><p>3. Proper case-mouth chamfering is very, very important for accuracy and optimal ES and SD. With these long bullets you want the entrance to the case mouth as perfect as possible.</p><p></p><p>4. Experiment with shooting the VLDs OFF the lands. While the 180gr VLDs, typically, work best seated .010″ or more into the lands, some shooters have obtained excellent accuracy jumping their bullets .020″ or more. It's worth trying.</p><p> Very low ES/SD is possible</p><p></p><p>5. WSM brass really stiffens with time. For best results you may need to adjust neck tension (switch bushings) after a few reloadings. Annealing can also help after four or five reloading cycles."</p><p></p><p>unquote</p><p></p><p></p><p>This must be where I got the neck tension ES information that I wrote earlier. So I chose the mid road for my thick 375 Ruger brass for its clearance base on the above.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1094719, member: 5219"] I will make a note so I can let you know Rich. I won't be installing and chambering that 284 for a while. My 7mm/375 Ruger has .0035" per side with .002" neck tension. The beauty of either of these 7mms is that I could adjust the neck turning tool to skim off .0005" -.001 per side with ease to change the fit. ----------------------------- FYI on Accurate shooter in the 7mm info page, they suggest that .003"-.004" is best for the 7 WSM. quote: "WSM cases need adequate neck clearance in the chamber for bullet release. Total Clearance of .003″-.004″ (both sides combined) will probably better than .0015″ or less." Also....quote: "Producing Better WSM Ammo Here are some advanced reloading tips gathered from successful 7mm WSM shooters. 1. Turn the necks, particularly with Winchester brass. This will help with neck-wall uniformity and bullet release. WSM cases need adequate neck clearance in the chamber for bullet release. Total Clearance of .003″-.004″ (both sides combined) will probably better than .0015″ or less. 2. Make sure you have sufficient clearance between the neck and the side of the chamber. Some guys running with super-tight clearance on the necks had persistant and frustrating accuracy problems and unexplained flyers. Adding neck clearance (by turning the necks) cured the flyers. Three or four thousandths total clearance (sum of both sides) will probably work better than one-thousandth. 3. Proper case-mouth chamfering is very, very important for accuracy and optimal ES and SD. With these long bullets you want the entrance to the case mouth as perfect as possible. 4. Experiment with shooting the VLDs OFF the lands. While the 180gr VLDs, typically, work best seated .010″ or more into the lands, some shooters have obtained excellent accuracy jumping their bullets .020″ or more. It’s worth trying. Very low ES/SD is possible 5. WSM brass really stiffens with time. For best results you may need to adjust neck tension (switch bushings) after a few reloadings. Annealing can also help after four or five reloading cycles." unquote This must be where I got the neck tension ES information that I wrote earlier. So I chose the mid road for my thick 375 Ruger brass for its clearance base on the above. [/QUOTE]
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