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Rifles, Reloading, Optics, Equipment
Reloading
case expansion
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<blockquote data-quote="dcb" data-source="post: 75931" data-attributes="member: 2583"><p>nowler, said you need a base line to compare to and i agree.</p><p> The method I use is for the average hand loader with a good basic knowledge of reloading.</p><p> Take in to account that the chamber is slightly larger than the cartrage.</p><p> The higher the pressure the more the case expands.</p><p>I pay close attention to the expansion ring.</p><p> I have a paper clip sharpened to a point and bent to right angle about 1/4" long. long enough to reach the inside expansion ring and lightly pull the point across the ring looking for a grouve.</p><p> primer flatness or with an iron look can mean high pressure and the cratered indent, gas leak around the primer.shiney spots on the case head or extractor marks on the base.</p><p> stiff bolt lift or hard extraction.</p><p>measuring case expansion in my opinion will get you in trouble. there are other signs you need to pay attention to.</p><p> I also use a chrono when developing loads. bullets fly best when they are loaded to a velocity suited for that bullet and rifle.</p><p> There is a point where the velocity gain to powder ratio</p><p> Is minimual and that is where I watch for pressure signs and some times with fast pwders that will get you in trouble.</p><p> Hope this helps Dave</p></blockquote><p></p>
[QUOTE="dcb, post: 75931, member: 2583"] nowler, said you need a base line to compare to and i agree. The method I use is for the average hand loader with a good basic knowledge of reloading. Take in to account that the chamber is slightly larger than the cartrage. The higher the pressure the more the case expands. I pay close attention to the expansion ring. I have a paper clip sharpened to a point and bent to right angle about 1/4" long. long enough to reach the inside expansion ring and lightly pull the point across the ring looking for a grouve. primer flatness or with an iron look can mean high pressure and the cratered indent, gas leak around the primer.shiney spots on the case head or extractor marks on the base. stiff bolt lift or hard extraction. measuring case expansion in my opinion will get you in trouble. there are other signs you need to pay attention to. I also use a chrono when developing loads. bullets fly best when they are loaded to a velocity suited for that bullet and rifle. There is a point where the velocity gain to powder ratio Is minimual and that is where I watch for pressure signs and some times with fast pwders that will get you in trouble. Hope this helps Dave [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
case expansion
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