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Dubya
Reply with quote  #9 
Well, there you go! Dave Kiff told me to use .120 throat with VLDs' on my 6BRX and so for has worked out very well. Good luck with your project and have fun.
dubya.
ChrisNam
Reply with quote  #10 
Moderator, Jim, Bill & Dubya
Thanx for the advise, but just as I thought I`ve sorted everything out, you bring up the next minefield. What freebore do you think is best for the 105-107 gr bullets? I thought I could simply use the same reamer for my 1:12 twist barrel shooting the 80gr Bergers (to br used for hunting), but it now seems as if a seperate reamer and custom dies are required, or are there an compomise?
Confused in Namibia
6Dasher
Reply with quote  #11 
With the short neck cases like the Dasher and BRX, it can't be optimal for both the 80gr and 107gr bullets. You have to "compromise" one of the two. Look at which you want to put the most emphasis on, 107 for long range or 80gr for varminting and such. I have a 0.60 freebore (for 95VLD) and shoot 105gr and 88LD bullets as well. These two stock below the shoulder/neck junction, but they still shoot tiny groups.
Moderator
Reply with quote  #12 
Jim raises a good point. But if you want a compromise freebore, consider something about .080" With this Freebore in my 6BR, the 105 Scenars' bearing surface starts about .060 above the neck-shoulder junction with the bullet .010" into lands. I have enough neck to support the 95 VLDs, going .008" into the lands (though the amount of shank in neck is pretty marginal, about .135"). Interestingly, with the .080 Freebore, my Lapua factory 105gr ammo is about .010" from the lands. So obviously this is a set-up that Lapua thinks can give pretty good accuracy.

If I was throating just for the 105s/107s I'd want a .100-115" freebore. This will let you load a little hotter. Please note that all these freebore numbers are based on Kiff's Pacific Reamer prints. Other reamer makers measure differently. But something in the .075-.080" range should be very versatile, without giving up much for the longer bullets.
BountyHunter
Reply with quote  #13 
What seems to be the freebore needed for the 95 gr BIB FB bullets and what else will work with it?

BH
Moderator
Reply with quote  #14 
Bounty Hunter,

The 95s have a pretty long bearing surface for their weight. We've loaded some test rounds, just touching the lands, and the base maybe .020-.030 above the neck-shoulder junction in a rifle with a .080 Freebore. So... we'd suggest a .100-.120" freebore, the same you'd use with the 105-107gr bullets. Basically if you have an 8-twist set for the 105s, these will shoot fine, though a 10-twist might be ideal.
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