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7mm freebore

 
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  #1  
Old 12-13-2009, 08:26 AM
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7mm freebore

What freebore is needed for the 168gr and 180gr Bergers in a reamer in order to put the BT of the 180 Berger at the neck/shoulder junction, and what does that do to the 168 BT location. Looking at buying a 7 STW reamer. And is there a compromise between the 168 and 180's for freebore that will work for both ?
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Old 12-13-2009, 09:35 AM
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Re: 7mm freebore

Call Dave Kiff at PT&G and discuss it with him before you order the reamer from him.
Dave


Welcome To Pacific Tool and Gauge Inc. -- Reamers, Gauges, Bushings, and more.
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Old 12-13-2009, 09:45 AM
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Re: 7mm freebore

Quote:
Originally Posted by dirtball View Post
Call Dave Kiff at PT&G and discuss it with him before you order the reamer from him.
Dave


Welcome To Pacific Tool and Gauge Inc. -- Reamers, Gauges, Bushings, and more.
+1

Have the loaded length (Maximum Magazine length) ready when you call) And also how much free bore you want (.020 thousandths to the lands for example)and he can fix you up.

J E CUSTOM
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  #4  
Old 12-13-2009, 01:20 PM
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Re: 7mm freebore

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 ?
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