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Rifles, Reloading, Optics, Equipment
Reloading
CUPs compaired to PSIs
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<blockquote data-quote="Hugnot" data-source="post: 2117387" data-attributes="member: 115658"><p>I always look at established load data, in this situation is Hodgdon's 6.5X47 Lapua data for 140 Berger VLD using max charge of 39.5 gr. StaBALL 6.5 having a CUP of 52,400. Being curious of about the <em>approximate</em> PSI equivalent would be I stumbled upon the link provided above. Reading into this stuff I found a regression analysis that looked valid. A formula was shown. I took the formula and plugged it into an excel spread sheet to convert both. The regression analysis sure shows a correlation between CUP & PSI.</p><p></p><p>[ATTACH]251935[/ATTACH][ATTACH]251936[/ATTACH][ATTACH]251941[/ATTACH]</p><p></p><p>The formula for each conversion is shown - these are ANSI CUP & ANSI PSI values.</p><p></p><p>The regression plot is shown on page 4 of the link</p><p></p><p>I have a 8 twist 6.5X47 Lapua and some 140 grain Barnes Match burners & some StaBALL 6.5 for shooting steel. I also have some 123 ELD's that I might shoot at rodents, if seen during the same trip. I will work up a load for both.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2117387, member: 115658"] I always look at established load data, in this situation is Hodgdon's 6.5X47 Lapua data for 140 Berger VLD using max charge of 39.5 gr. StaBALL 6.5 having a CUP of 52,400. Being curious of about the [I]approximate[/I] PSI equivalent would be I stumbled upon the link provided above. Reading into this stuff I found a regression analysis that looked valid. A formula was shown. I took the formula and plugged it into an excel spread sheet to convert both. The regression analysis sure shows a correlation between CUP & PSI. [ATTACH alt="Screenshot (98).png"]251935[/ATTACH][ATTACH alt="Screenshot (99).png"]251936[/ATTACH][ATTACH]251941[/ATTACH] The formula for each conversion is shown - these are ANSI CUP & ANSI PSI values. The regression plot is shown on page 4 of the link I have a 8 twist 6.5X47 Lapua and some 140 grain Barnes Match burners & some StaBALL 6.5 for shooting steel. I also have some 123 ELD's that I might shoot at rodents, if seen during the same trip. I will work up a load for both. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
CUPs compaired to PSIs
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