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Rifles, Reloading, Optics, Equipment
Gunsmithing
.338 Lapua on small shank savage action
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<blockquote data-quote="J E Custom" data-source="post: 1019835" data-attributes="member: 2736"><p>They , like everyone else finally realized that with reloading becoming more popular in order to gain velocity a larger shank was needed to minimize the chamber expansion, making extraction easier.</p><p></p><p>When a rifle/firearm is fired the chamber will expand. it will return to it's original dimension when pressure drops because it has not yielded (The pressure did not exceed yield strength) but the brass has reach yield and does not return to its original size so the chamber is now squeezing the brass</p><p>making extraction harder. </p><p></p><p>The thicker the chamber walls the less effort it takes to extract. so the largest shank that is practical is always best.</p><p></p><p>For the big high pressure cases (64,000 Psi) I prefer the 1.250 + shank diameter and prefer to barrel the savages without the barrel nut so I can use a 1.250 barrel shank to add that extra .250</p><p>of chamber wall.</p><p></p><p>This is just my preference is not necessary as long as factory loads are used(Lower pressures and velocities) extraction should not be a problem.</p><p></p><p>So in my opinion, the small shank should not be used for cases larger than the Standard Magnums (.540)</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1019835, member: 2736"] They , like everyone else finally realized that with reloading becoming more popular in order to gain velocity a larger shank was needed to minimize the chamber expansion, making extraction easier. When a rifle/firearm is fired the chamber will expand. it will return to it's original dimension when pressure drops because it has not yielded (The pressure did not exceed yield strength) but the brass has reach yield and does not return to its original size so the chamber is now squeezing the brass making extraction harder. The thicker the chamber walls the less effort it takes to extract. so the largest shank that is practical is always best. For the big high pressure cases (64,000 Psi) I prefer the 1.250 + shank diameter and prefer to barrel the savages without the barrel nut so I can use a 1.250 barrel shank to add that extra .250 of chamber wall. This is just my preference is not necessary as long as factory loads are used(Lower pressures and velocities) extraction should not be a problem. So in my opinion, the small shank should not be used for cases larger than the Standard Magnums (.540) J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
.338 Lapua on small shank savage action
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