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270 win vs 280 ai

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  #1  
Unread 04-30-2014, 07:36 AM
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270 win vs 280 ai

Other than having to sell all my 270 win bullets & dies and quite a bit more work converting 270 brass to 280ai CAN ANYONE CONVINCE ME to stay with 270 win on my re barrel project ??? Particularly from an accuracy standpoint. Target pics welcome.
(Come on Royinidaho)

Keep in mind, I have two 7mm rem mags already.

Last edited by tbrice23; 04-30-2014 at 07:42 AM. Reason: add
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  •   #2  
    Unread 04-30-2014, 08:34 AM
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    Re: 270 win vs 280 ai

    Just do a 270AI or 270 Sherman.

    Velocity for the 270 Sherman is the same(or better) as the 280AI and have a higher BC bullet in the same weight. The 270 Sherman will drive the 165 Matrix 3000fps+. The 280AI has about 5% less powder capacity than a 270 Sherman. A straight 270 Win will be 150fps or so slower.

    7mm Matrix vld bc .608

    270 Matrix 165 vld .650.

    7mm 180 Berger vld bc .659

    270 Matrix 175 vld bc .680
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      #3  
    Unread 04-30-2014, 08:46 AM
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    Re: 270 win vs 280 ai

    I'm with coburnr I would do a 270ai or Sherman especially if you already have some 7s
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      #4  
    Unread 04-30-2014, 08:49 AM
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    Re: 270 win vs 280 ai

    I looked into it.
    Douglas has reamers for
    270 ai but no one has dies. I talked to Mark Penrod and he told me in 30 years gunsmithing he's never had a request for it.
    Do you know where to get the dies without 4month wait?
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      #5  
    Unread 04-30-2014, 08:55 AM
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    Re: 270 win vs 280 ai

    I think Rich (Elkaholic) has a source for dies and a reamer for the Sherman.

    http://www.longrangehunting.com/foru...kaholic-13833/
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      #6  
    Unread 04-30-2014, 09:09 AM
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    Re: 270 win vs 280 ai

    Quote:
    Originally Posted by tbrice23 View Post
    I looked into it.
    Douglas has reamers for
    270 ai but no one has dies. I talked to Mark Penrod and he told me in 30 years gunsmithing he's never had a request for it.
    Do you know where to get the dies without 4month wait?
    Redding 3-Die Set 270 Winchester Improved 40-Degree Shoulder

    You could always contact Redding to see if they happen to have a set sitting on the shelf... You just never know.
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      #7  
    Unread 04-30-2014, 06:15 PM
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    Re: 270 win vs 280 ai

    Why bother going ai imo. The 270 will hold nearly 70 grains of slow burning ball powder (yep, I've got some loaded with 69.5 gr. wc872 with a 130bonded at present) and over 60gr. of stick. You'll only get a few grains more powder in it after the ai job; that's a lot of cost to be "special". Use your 7mag's or step up to the 7stw or7rum if you want that extra bit of power. If you want more out of your standard bolt face consider a 338' 06 or 35 whelen.
    The biggest gain you get when loading for the ai rounds is loading them hotter due to reduced bolt thrust. The 5% or less you get in extra case capacity will net you 2.5% or less actual speed increase.
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