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338x8mm

diamondback77
just picked up an old k98 sporter thats been converted to 338x8mm does anyone know where i can find dies and reloading data for this round
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7 comments

Date Votes
  • Mobuck
    So, it's a .338 bore on the 8x57 case? Or is it the original 8mm bore on a necked down 338 case? Likely RCBS has dies, they have for almost anything.
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  • diamondback77
    338 case 8mm bore
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  • nononsense
    diamondback77,

    The way you wrote it originally, I was checking my notes for the 8x57 Mauser case necked up for the .338 bullets. This has been referred to as the 8.5x57 which is a wildcat.

    Which .338 case, the .338 Winchester Magnum? Or...

    You can use bushing dies to make the cases since the standard .338 WM die will accept the bushings required to step the neck down in size to 8mm (0.323" bullets).

    Best.
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  • Mobuck
    Lots of questions still unanswered. Maybe a chamber cast would be in order. You need to check the boltface to see if it's been opened up to .532 for the magnum base. Conservatively, a starting load for the 300 Win mag with 180-200 grain bullets SHOULD be safe with the 8mm bore using the same weights. Keep in mind that even starting loads for the magnum cases maybe close to the working pressure of the old 8mm original case. Use extreme care in this project to avoid serious consequences.
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  • MIKE WISKEY
    "338 case 8mm bore"............ that would be a 8mmx.338, all you would need are a set of reloading dies., one pass and you turn .338's into 8mmx.338's. still a custom die and pricey. you can check with rcbs (hunington). you could also use .338 loading data (conservatively).
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  • 7.62x39Lover
    quote:Originally posted by nononsense
    diamondback77,

    The way you wrote it originally, I was checking my notes for the 8x57 Mauser case necked up for the .338 bullets. This has been referred to as the 8.5x57 which is a wildcat.

    Which .338 case, the .338 Winchester Magnum? Or...

    You can use bushing dies to make the cases since the standard .338 WM die will accept the bushings required to step the neck down in size to 8mm (0.323" bullets).

    Best.




    8.5x57mm sounds like a serious "man stopper". I'd love to go hunting with a round like that.
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  • ern98
    I second the suggestion on doing a chamber cast. The casting material is cheap, available from Brownells and comes with easy to follow instructions on how to get a perfect cast on the first try. All you need is a simple plummers propane torch and some kind of ladel to melt in and pour from.
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