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Rifles, Reloading, Optics, Equipment
Reloading
Belted magnums reloading, from scratch
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<blockquote data-quote="woods" data-source="post: 302720" data-attributes="member: 6042"><p>Here is a typical example of measurements of head clearance taken on a belted mag with a Hornady Headspace Gauge from the case head to the datum line</p><p></p><p>Manufacturer / caliber / new case / once fired / full expanded (after 3 or 4 firings) / head clearance on new cases / % expansion first firing</p><p>Beretta / 338 win mag / 2.097" / 2.120" / 2.124" / .027" / 85%</p><p>Browning / 300 win mag / 2.253" / 2.270" / 2.273" / .020" / 85%</p><p>Beretta / 300 win mag / 2.253" / 2.270" / 2.2725" / .0195" / 87%</p><p>Win P-64 / 264 win mag / 2.109" / 2.136" / 2.1385" / .0295" / 91%</p><p></p><p>On these the actual headspace measured on the belt varied from .003" to .007".</p><p></p><p>So 85% to 90% of the case expansion occurs on the initial firing. Wouldn't this be when the most thinning at the web would happen?</p><p></p><p>And I do headspace on the shoulder as soon as possible with the belted mags and I still got a head separation on that 338 win mag on the 6th firing of the case. I push the shoulder back no more than .001" and always leave a slight crush fit.</p><p></p><p>MagnumManiac, do you have any data to support your claims?</p></blockquote><p></p>
[QUOTE="woods, post: 302720, member: 6042"] Here is a typical example of measurements of head clearance taken on a belted mag with a Hornady Headspace Gauge from the case head to the datum line Manufacturer / caliber / new case / once fired / full expanded (after 3 or 4 firings) / head clearance on new cases / % expansion first firing Beretta / 338 win mag / 2.097" / 2.120" / 2.124" / .027" / 85% Browning / 300 win mag / 2.253" / 2.270" / 2.273" / .020" / 85% Beretta / 300 win mag / 2.253" / 2.270" / 2.2725" / .0195" / 87% Win P-64 / 264 win mag / 2.109" / 2.136" / 2.1385" / .0295" / 91% On these the actual headspace measured on the belt varied from .003" to .007". So 85% to 90% of the case expansion occurs on the initial firing. Wouldn't this be when the most thinning at the web would happen? And I do headspace on the shoulder as soon as possible with the belted mags and I still got a head separation on that 338 win mag on the 6th firing of the case. I push the shoulder back no more than .001" and always leave a slight crush fit. MagnumManiac, do you have any data to support your claims? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Belted magnums reloading, from scratch
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