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7mm Rem Mag Throat

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  #1  
Unread 09-12-2011, 12:58 PM
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7mm Rem Mag Throat

Now that you helped with barrel length.

How about throat? I am setting it up for 180gn Berger VLD.

Would the ideal seating length put the boatail/body junction of the bullet at the shoulder neck junction of the case?

There is plenty of room in the magazine. (700LA)

I have a short throat reamer with a throating reamer to set the lenght.

Thanks!
Denny
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  •   #2  
    Unread 09-12-2011, 01:21 PM
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    Re: 7mm Rem Mag Throat

    I don't have an answer, but I also am curious as I recently saw where someone raised the issue of throat errosion and suggested not making the throat too long for initial chambering.
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      #3  
    Unread 09-12-2011, 01:27 PM
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    Re: 7mm Rem Mag Throat

    That is a good concern. Too short and you are just shooting yourself in the foot though.... Reduced powder capacity and possibly velocity. I have done nothing with a 7mm Rem Mag before, so this is new to me. Most of my custom builds have been 6.5 and under and defiantly not magnums.
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      #4  
    Unread 09-12-2011, 01:39 PM
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    Re: 7mm Rem Mag Throat

    Where is that thread about throat erosion you talked about?
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      #5  
    Unread 09-12-2011, 02:01 PM
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    Re: 7mm Rem Mag Throat

    Just brief mention made by SBruce... Question on jump
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      #6  
    Unread 09-12-2011, 02:10 PM
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    Re: 7mm Rem Mag Throat

    Quote:
    Originally Posted by denphillips2 View Post
    That is a good concern. Too short and you are just shooting yourself in the foot though.... Reduced powder capacity and possibly velocity. I have done nothing with a 7mm Rem Mag before, so this is new to me. Most of my custom builds have been 6.5 and under and defiantly not magnums.

    Throating a chamber short has it's advantages but it also has its disadvantages to.

    If you build a rifle around a particular style and weight of bullet it will sometimes come back
    to haunt you because the barrel may not like the bullet and your stuck with rechambering
    or at least re throating the chamber.

    If you are lucky and the barrel likes that bullet Great. But if it doesent hang on.

    Most of us like velocity and more free bore/throat is one way to get it without excessive
    pressure.

    This will always be a debate and there are lots of opinions as to which way to go. I prefer
    building a rifle that will shoot most any bullet well, rather than build one for one bullet and
    risk getting one that wont shoot anything with out re doing it.

    Free bore is not a problem if the rifle is built correctly (Just like the belted cases) and in many
    cases it is a plus.

    I recomend a standard chamber to all but the most experanced who can trouble shoot a problem
    and work it out.

    There are many reasons to use a special throat dimension but none that can't be overcome
    with proper planing In My Opinion.

    So be prepared for issues if you short throat your mag.

    J E CUSTOM
    __________________
    "PRESS ON"

    Last edited by J E Custom; 09-12-2011 at 07:26 PM.
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      #7  
    Unread 09-12-2011, 02:54 PM
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    Re: 7mm Rem Mag Throat

    JE,

    I think the OP was about using a longer throat to accomodate VLDs.

    I was pointing out that too long might be a problem over time as the throat errodes.

    Are you recommending a standard throat length with sufficient freebore to accomodate VLDs seated a little further out?

    thanks!
    Richard

    p.s. to your point about taking a chance on rechambering, I imagine Shawn Carlock and Kirby Allen just consider barrels expendable in their R&D with throat designs for the +P, etc...

    Last edited by rscott5028; 09-12-2011 at 02:56 PM. Reason: after thought
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