Gents,
What anyone using for the freebore amount for there 7mm? Im going to build a 7mm-08AI for F-Open and need to know best freebore for this cartrdge.
Cheers all.
Freebore for 7mm-08AI with 168gr VLD and 180gr VLDs
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Freebore for 7mm-08AI with 168gr VLD and 180gr VLDs
Shaun aka 'Quick'
Yanchep, Western Australia
308 Win F/TR & F-S
7mm F-Open Shooter.
Yanchep, Western Australia
308 Win F/TR & F-S
7mm F-Open Shooter.
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Shaun,
For the purposes of avoiding the donut area, the 180 VLD require the most free bore of any of the common 7mm target projectiles. You'd be best to base your free bore to suit the 180VLD and take what you get for the 168 and any others. Some will be seated only halfway up the neck, but this doesn't seem to be a problem unless you turn the necks ultra thin and are struggling for neck tension. So I would go for the generally recommended free bore figure of 0.220" to suit the 180s. Mine is 0.239" but probably overkill.
Alan
For the purposes of avoiding the donut area, the 180 VLD require the most free bore of any of the common 7mm target projectiles. You'd be best to base your free bore to suit the 180VLD and take what you get for the 168 and any others. Some will be seated only halfway up the neck, but this doesn't seem to be a problem unless you turn the necks ultra thin and are struggling for neck tension. So I would go for the generally recommended free bore figure of 0.220" to suit the 180s. Mine is 0.239" but probably overkill.
Alan
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Alan,
Cheers for that mate. I am happy to turn to get rid of donut if needed so thats not much of an issue. But I'm planning on using unturned brass anyway. Ideally id like to have base bullets bearing surface seated at the neck shoulder junction to maximine the amount of neck holding the bullet. But if its not exactly that it shouldnt be an issue. I cant see the 7mm-08AI burning throats like my 6mm's do![Smile :)](./images/smilies/icon_smile.gif)
Cheers for that mate. I am happy to turn to get rid of donut if needed so thats not much of an issue. But I'm planning on using unturned brass anyway. Ideally id like to have base bullets bearing surface seated at the neck shoulder junction to maximine the amount of neck holding the bullet. But if its not exactly that it shouldnt be an issue. I cant see the 7mm-08AI burning throats like my 6mm's do
![Smile :)](./images/smilies/icon_smile.gif)
Shaun aka 'Quick'
Yanchep, Western Australia
308 Win F/TR & F-S
7mm F-Open Shooter.
Yanchep, Western Australia
308 Win F/TR & F-S
7mm F-Open Shooter.
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Matt,
Cheers mate. 205-210 seems to be a decent compromise between them. I can't see 10-15 thou making much differnece but I have been known to be wrong a fair bit
I'm spewing the reamer now so will see what PTG recommend and then probably go with around 205-210I think.
Richard,
Cheers mate. I'm liking the 168gr for the shorts for when it's to rough for my 6mm. This could end up being my only F-Open cal if it performs as well as I would like. Otherwise I'll just save it for rainy days.
Cheers mate. 205-210 seems to be a decent compromise between them. I can't see 10-15 thou making much differnece but I have been known to be wrong a fair bit
![Smile :)](./images/smilies/icon_smile.gif)
I'm spewing the reamer now so will see what PTG recommend and then probably go with around 205-210I think.
Richard,
Cheers mate. I'm liking the 168gr for the shorts for when it's to rough for my 6mm. This could end up being my only F-Open cal if it performs as well as I would like. Otherwise I'll just save it for rainy days.
Shaun aka 'Quick'
Yanchep, Western Australia
308 Win F/TR & F-S
7mm F-Open Shooter.
Yanchep, Western Australia
308 Win F/TR & F-S
7mm F-Open Shooter.
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