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Thread: Lapua Brass Cases - for .260 Remington - or - 7mm-08 Remington Application

  1. #1
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    Aug 2005
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    Lapua Brass Cases - for .260 Remington - or - 7mm-08 Remington Application

    Wanting to use Lapua cases in either a .260 Remington - or - 7mm-08 Remington application.

    Questions:

    From your experience, would it be best to neck up .243 Winchester Lapua brass cases - or - neck down .308 Winchester Lapua brass cases ?

    From your experience, what process and tools are required for each ?

    Thanks!

    Old Cob

  2. #2
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    Oct 2003
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    A trip through a FL size die should convert the 308 to either with no problem. You may want to size in a 308 die first. Check the neck thickness and trim length afterward.
    Regards, Ron

  3. #3
    Join Date
    Dec 2003
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    washington.........STATE that is.
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    Opinions;

    Blowing out from .243 using shotgun powder will result in the longest and most uniform necks, as well as the thinner than from .308 brass. If you have a custom chamber this could work.... it's also a pita.

    Necking up using a mandrel will result in the most non-uniform and thinnest necks.

    Necking down from .308 using a die(s) will give thickest neck brass. Necks will form crooked using a single pass through a 260/7-08 die but will be adequate for any factory app. Necking down using a stepped neck bushing will yield straight necks but is quite expensive. Necking down from 308 will generally result in a donut.



    All are "doable" but I'd probably choose to neck down the .308 brass if it's a factory rifle. I suggest you get your new die and just cram the cases thru it, one pass and you're shooting. 99% of the world will be made happy by this procedure.

    al

  4. #4
    Join Date
    Feb 2003
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    Middle Tennessee
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    I've tried it both ways and prefer using .243 brass. (assuming there is no possiblity of a .260 round being loaded in a .243) If you've a factory rifle probably either way would work but my first go at this sort of thing was with a custom barreled rifle in 7-08and .308 brass had to be neck turned while .243 didn't.
    I was able to load full power loads from the get go with the resized brass and I guess I'm in the 99% because I found the accuracy to be more than very good.

  5. #5
    Join Date
    Oct 2005
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    I know you asked about Lapua, but Norma makes 7-08 brass. I don't use it because I'm not wealthy enough.
    Joe

  6. #6
    Join Date
    May 2004
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    291
    Nosler makes .260 Rem brass as well.

  7. #7
    Join Date
    Aug 2005
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    I am in process of buying a Browning A-Bolt titanium offered in 7mm-08. Plans are to shoot "as is" for the time being, but possibly custom rebarrel to .260 Remington or .260 Remington AI in the future. Weird huh ?

    Years ago I bought a set of Redding forming dies for reforming 30 caliber mag cases to 7mm Remington mag and they worked pretty slick.

    I have not checked yet, but there most likely is a forming die set for application of .308 Winchester to either a .260 Remington - or - 7mm-08 Remington offered by Redding.

    Although others have suggested just using a full length die, my past experience forming magnum cases has not produced satisfactory results, but most likely was something I was - or - was not doing during forming process.

    Old Cob

  8. #8
    Join Date
    Aug 2003
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    322
    I would cull out a handful of 308 cases with high thickness variance, and neck turn trial & error for settings that produce a good thickness after downsizing. If you turn up onto the neck shoulder a bit & with downsizing, there won't be any doughnut. You can also leave your false shoulder for fireforming headspace. I would improve a 260, as there is plenty that can be in stock form.
    I suppose now you have your pick of small or large primer in 308 brass. But I'd stay with large for this capacity..

  9. #9
    Join Date
    Sep 2009
    Posts
    103
    I load 243 and 260 for my granddaughter. The 260 came first and I prefered to neck up 243 brass to 260. 308 was a little shorter than 260 min trim length and it made the neck pretty thick. She now has a 243 also, so I no longer resize either. I keep all brass sized to the headstamp to minimize the chance of her shooting a 243 bullet in her 260 or try and load a 260 in her 243.

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