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Rifles, Reloading, Optics, Equipment
Reloading
question on tight neck chambers
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<blockquote data-quote="Varmint Hunter" data-source="post: 106195" data-attributes="member: 313"><p>[ QUOTE ]</p><p> i have read some where that for a bolt action rifle you want .002-.004 neck tension is this the same thing only .009 ? thanks for your help ,Brian </p><p></p><p>[/ QUOTE ]</p><p></p><p>NO - The .009" reference is the neck wall thickness, presumably after neck turning. The .002-.004" is a reference to how much smaller the neck diameter is (after sizing) compared to what it will be when the bullet is seated. This measurement is often called " neck tension".</p><p></p><p>Generally speaking, with a .262" neck you would want (aprox) a loaded round neck diameter of .260", thus leaving .002" of neck clearance for bullet release. To get a loaded round neck diameter of .260" you must subtract the actual bullet diameter of .243", which leaves .017" for the brass tubing itself. Since the neck is on each side of the bullet you divide the .017" by 2. This will give you .0085" for the neck wall thickness.</p><p></p><p>Last consideration - When determining the proper bushing for sizing you merely determine what your loaded round neck diameter will be and subtract (aprox) .003". This allows for .001" "spring-back" of the brass and leaves .002" neck tension.</p><p></p><p>Bottom line for someone new to tight neck chambers:: Make certain of you chamber neck diameter before begining and carefully measure you finished handloads to make certain that they will fit in the chamber with adequate room for safe bullet bullet release. (Typically .002" or more even though some benchrest shooters will use slightly less).</p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="Varmint Hunter, post: 106195, member: 313"] [ QUOTE ] i have read some where that for a bolt action rifle you want .002-.004 neck tension is this the same thing only .009 ? thanks for your help ,Brian [/ QUOTE ] NO - The .009" reference is the neck wall thickness, presumably after neck turning. The .002-.004" is a reference to how much smaller the neck diameter is (after sizing) compared to what it will be when the bullet is seated. This measurement is often called " neck tension". Generally speaking, with a .262" neck you would want (aprox) a loaded round neck diameter of .260", thus leaving .002" of neck clearance for bullet release. To get a loaded round neck diameter of .260" you must subtract the actual bullet diameter of .243", which leaves .017" for the brass tubing itself. Since the neck is on each side of the bullet you divide the .017" by 2. This will give you .0085" for the neck wall thickness. Last consideration - When determining the proper bushing for sizing you merely determine what your loaded round neck diameter will be and subtract (aprox) .003". This allows for .001" "spring-back" of the brass and leaves .002" neck tension. Bottom line for someone new to tight neck chambers:: Make certain of you chamber neck diameter before begining and carefully measure you finished handloads to make certain that they will fit in the chamber with adequate room for safe bullet bullet release. (Typically .002" or more even though some benchrest shooters will use slightly less). Hope this helps. [/QUOTE]
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question on tight neck chambers
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