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Rifles, Reloading, Optics, Equipment
Gunsmithing
7mm freebore
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<blockquote data-quote="trueblue" data-source="post: 338414" data-attributes="member: 10654"><p>I know what the COAL will be based on a reamer print and the length of the Bergers from the top of the BT to the end.</p><p>Just trying to figure out how to determine what freebore I need to make both work.</p><p> </p><p>168gr Berger oal= 1.445</p><p>- .220 for BT</p><p>---------</p><p>1.225 + 2.582( boltface to neck/shoulder of 7 STW)= 3.807 COAL w/ 168gr Bergers seated w BT @ neck/ shoulder = 3.807</p><p> </p><p>180gr Berger oal=1.525</p><p>- .220 for BT</p><p>________</p><p>1.305+ 2.582(boltface to neck/shoulder of 7 STW)= 3.887</p><p> </p><p>So if I comprimise the COAL of 3.840-3.850 it should be fine for both bullets.</p><p>Just don't know how to determine the freebore for this setup. The 168's should still be seated deep enough in the neck, and the 180's should not be seated to deep. What freebore are you guys using on your 7 STW reamers and what is the COAL of the Bergers seated on the lands ?</p></blockquote><p></p>
[QUOTE="trueblue, post: 338414, member: 10654"] I know what the COAL will be based on a reamer print and the length of the Bergers from the top of the BT to the end. Just trying to figure out how to determine what freebore I need to make both work. 168gr Berger oal= 1.445 - .220 for BT --------- 1.225 + 2.582( boltface to neck/shoulder of 7 STW)= 3.807 COAL w/ 168gr Bergers seated w BT @ neck/ shoulder = 3.807 180gr Berger oal=1.525 - .220 for BT ________ 1.305+ 2.582(boltface to neck/shoulder of 7 STW)= 3.887 So if I comprimise the COAL of 3.840-3.850 it should be fine for both bullets. Just don't know how to determine the freebore for this setup. The 168's should still be seated deep enough in the neck, and the 180's should not be seated to deep. What freebore are you guys using on your 7 STW reamers and what is the COAL of the Bergers seated on the lands ? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
7mm freebore
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