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Rifles, Reloading, Optics, Equipment
Reloading
Case web expansion help
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<blockquote data-quote="bigedp51" data-source="post: 1315343" data-attributes="member: 28965"><p>Head clearance is the distance the base of the case has to stretch to meet the bolt face. But the strength of the brass and case design governs if and how much the case will stretch when fired.</p><p></p><p>The thin Winchester case in my photo above stretched .009 "BUT" my Prvi Partizan cases did not stretch when fired in the same Enfield rifle.</p><p></p><p></p><p><img src="http://i.imgur.com/sHgqVJR.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Both cases below were fired in the same .303 British Enfield rifle. The Priv case did not stretch or thin when fired because of brass hardness and its design. The Priv case is larger in diameter, and is .010 thicker in base wall thickness than the Winchester case.</p><p></p><p><img src="http://i.imgur.com/eM3H3ls.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Example a Federal .308 case will expand more in the base and also stretch and thin far more the a Lake City 7.62 case with its thicker and harder case.</p><p></p><p>Bottom line the quality of the case and its construction governs stretch and base expansion, So measuring stretch and base expansion will tell you a great deal about the quality of your cases.</p><p></p><p>I buy bulk Lake City 5.56 and 7.62 cases and some of it was fired in machine guns and I find very few that stretched and thinned. So military cases are made Ford Truck Tough. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>CatShooter and I are good friends, and we met arguing over CatShooter lubing his cases to keep them from stretching. I learned a great deal about headspace and case construction by collecting British Enfield rifles. And I played with my bolt heads until I nearly went blind.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></p><p></p><p><img src="http://i.imgur.com/v1GFvaK.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The OP stated he has over .002 base expansion with top grade Lapua brass. The OP is either loading too hot or measuring the case in the wrong area. And if the OP does not have any brass flow into the ejector then my guess would be he is measuring the case in the wrong area.</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1315343, member: 28965"] Head clearance is the distance the base of the case has to stretch to meet the bolt face. But the strength of the brass and case design governs if and how much the case will stretch when fired. The thin Winchester case in my photo above stretched .009 "BUT" my Prvi Partizan cases did not stretch when fired in the same Enfield rifle. [IMG]http://i.imgur.com/sHgqVJR.gif[/IMG] Both cases below were fired in the same .303 British Enfield rifle. The Priv case did not stretch or thin when fired because of brass hardness and its design. The Priv case is larger in diameter, and is .010 thicker in base wall thickness than the Winchester case. [IMG]http://i.imgur.com/eM3H3ls.jpg[/IMG] Example a Federal .308 case will expand more in the base and also stretch and thin far more the a Lake City 7.62 case with its thicker and harder case. Bottom line the quality of the case and its construction governs stretch and base expansion, So measuring stretch and base expansion will tell you a great deal about the quality of your cases. I buy bulk Lake City 5.56 and 7.62 cases and some of it was fired in machine guns and I find very few that stretched and thinned. So military cases are made Ford Truck Tough. :D CatShooter and I are good friends, and we met arguing over CatShooter lubing his cases to keep them from stretching. I learned a great deal about headspace and case construction by collecting British Enfield rifles. And I played with my bolt heads until I nearly went blind.:rolleyes: [IMG]http://i.imgur.com/v1GFvaK.jpg[/IMG] The OP stated he has over .002 base expansion with top grade Lapua brass. The OP is either loading too hot or measuring the case in the wrong area. And if the OP does not have any brass flow into the ejector then my guess would be he is measuring the case in the wrong area. [/QUOTE]
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