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Cornmeal forming bad on a new barrel??

 
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  #15  
Old 01-24-2004, 06:04 AM
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Re: Cornmeal forming bad on a new barrel??

Interesting thread. I will be forming .284 wildcat cases from .338 Lapua cases. Do you think the extra amount of neck size reduction (over that of .338 down to .308) will require any changes in method?

[ 01-24-2004: Message edited by: Len Backus ]
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  #16  
Old 01-24-2004, 07:02 AM
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Re: Cornmeal forming bad on a new barrel??

Len

I would turn necks before fireforming.
I make my 338 tomahawk cases from 375 ultra mag brass and turn before fireforming and cases come out perfect

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Old 01-24-2004, 08:31 AM
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Re: Cornmeal forming bad on a new barrel??

Tomahawk

You're probably right but please explain why. My 7 Lapua's reamer's neck dimension will be .3150. I know from the experience with my 7mm Dakota that if I take off about one thou in turning that particular brand of brass, then my loaded round will measure .3113 for about .0037 total clearance.

With the 7 Lapua Improved project, in forming the neck down further, as stated above, will I get thicker necks and therefor have to experiment with a few unturned necks in fireforming before I then go ahead and turn a bunch of brass in advance of fireforming?
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Old 01-24-2004, 10:01 AM
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Re: Cornmeal forming bad on a new barrel??

Len

I would try a few as you stated but i think you will gain neck thickness when you take them down to 7mm

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  #19  
Old 01-24-2004, 01:03 PM
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Re: Cornmeal forming bad on a new barrel??

Yes, I thought so. I assumed I'd have to take more off if I want that same .3113 loaded dimension.
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Old 01-24-2004, 10:16 PM
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Re: Cornmeal forming bad on a new barrel??

Len

It would be interesting to know how much neck thickness you gained going from 338 to 7mm.

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Old 01-25-2004, 03:12 AM
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Re: Cornmeal forming bad on a new barrel??

Len,

<BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>Interesting thread. I will be forming .284 wildcat cases from .338 Lapua cases. Do you think the extra amount of neck size reduction (over that of .338 down to .308) will require any changes in method?<HR></BLOCKQUOTE>[

What's your neck length on this one going to be?

Have you go another die for this one, or where you planning on using the 30/338 LI die and smaller bushings?

Is this one just a necked down version of your 30/338 Lapua Imp, with the neck a tad shorter from necking it down smaller than 30?
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