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Rifles, Reloading, Optics, Equipment
Reloading
150 gr. ETip .308 Win powder choice?
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<blockquote data-quote="Hardbawl" data-source="post: 662625" data-attributes="member: 49292"><p><span style="font-family: 'Arial'">Davkrat:</span></p><p><span style="font-family: 'Arial'">I have a Winchester M70 that shows cratering with WW factory loads. Usually a bolt with a smaller firing pin hole [AKA Remington] does not show cratering early on. The Savage I'm working on now looks like the chamber will bulge before primers crater. Rifles are different.</span></p><p> </p><p><span style="font-family: 'Arial'">Ken Waters outlines a pressure measuring system in Handloader Magazine that has worked for me over the years. Basically you fire a factory round and measure [with a ten thousandths mic] the pressure ring. Size the case and reload with your recipe. This will reduce the pressure ring back to unfired condition. Now fire and measure again. Most work up loads will not equal the expansion of a factory load. A hot load will pop positive on the pressure ring. Anything more than .0002 over factory expansion is cause for concern. </span></p><p> </p><p><span style="font-family: 'Arial'">This is not a perfect system. But it does give us a handle on what is going on in the case. Yes, you have to full length size. And yes, brass work hardens so you probably should only trust a case to test pressure once.</span></p><p> </p><p><span style="font-family: 'Arial'">This may be a way for you to "see" exactly when your personal rifle "pops hot." Hope this helps.</span></p></blockquote><p></p>
[QUOTE="Hardbawl, post: 662625, member: 49292"] [FONT=Arial]Davkrat:[/FONT] [FONT=Arial]I have a Winchester M70 that shows cratering with WW factory loads. Usually a bolt with a smaller firing pin hole [AKA Remington] does not show cratering early on. The Savage I'm working on now looks like the chamber will bulge before primers crater. Rifles are different.[/FONT] [FONT=Arial][/FONT] [FONT=Arial]Ken Waters outlines a pressure measuring system in Handloader Magazine that has worked for me over the years. Basically you fire a factory round and measure [with a ten thousandths mic] the pressure ring. Size the case and reload with your recipe. This will reduce the pressure ring back to unfired condition. Now fire and measure again. Most work up loads will not equal the expansion of a factory load. A hot load will pop positive on the pressure ring. Anything more than .0002 over factory expansion is cause for concern. [/FONT] [FONT=Arial][/FONT] [FONT=Arial]This is not a perfect system. But it does give us a handle on what is going on in the case. Yes, you have to full length size. And yes, brass work hardens so you probably should only trust a case to test pressure once.[/FONT] [FONT=Arial][/FONT] [FONT=Arial]This may be a way for you to "see" exactly when your personal rifle "pops hot." Hope this helps.[/FONT] [/QUOTE]
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Reloading
150 gr. ETip .308 Win powder choice?
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