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Berger Integrity

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  #1  
Unread 08-14-2011, 08:33 AM
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Berger Integrity

Does anybody have info for the maximum velocity that a Berger bullet can be pushed to before coming apart? I know that twist rate has a hand in the outcome also. I am shooting 180 VLD,s at 3334 fps average with a 1 in 9 twist. I am having what appears to be bullet integrity problems at this velocity. I have called and talked to Berger but can not get a definite answer from them. I was just wondering if anyone has had any problems or experinces that they can share.
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  •   #2  
    Unread 08-14-2011, 08:41 AM
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    Re: Berger Integrity

    I have had no problems with the 180's at 3200 in a 9 twist and have shot 100's. I think Eddybo had some issues with them somewhere over 3400 in an 8 twist. If he doesn't join in here maybe send him a pm.

    Jeff
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      #3  
    Unread 08-14-2011, 10:09 AM
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    Re: Berger Integrity

    You can't ask for a limit 'for Berger bullets' because they are not all the same.
    But I had defined(as best I could) the RPM limits of Berger VLDs quite awhile back. Berger didn't like it one bit, but it has always held as useful(still for VLDs).
    For your situation:

    (720*MV/TW)/1000
    (720*3334/9)/1000
    KRPMs = 267 [your rate]

    (0.308-CAL)*238.095+290
    (0.308-.284)*238.095+290
    KRPM LIMIT = 296 [The point of expected failures]

    For the Eddybo mention:
    (720*3400/8)/1000
    KRPMs = 306 [This exceeds the 296 limit]

    So, it's not RPMs(or the energy to produce them) causing your failures.
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      #4  
    Unread 08-14-2011, 10:57 AM
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    Re: Berger Integrity

    Quote:
    Originally Posted by Mikecr View Post
    You can't ask for a limit 'for Berger bullets' because they are not all the same.
    But I had defined(as best I could) the RPM limits of Berger VLDs quite awhile back. Berger didn't like it one bit, but it has always held as useful(still for VLDs).
    For your situation:

    (720*MV/TW)/1000
    (720*3334/9)/1000
    KRPMs = 267 [your rate]

    (0.308-CAL)*238.095+290
    (0.308-.284)*238.095+290
    KRPM LIMIT = 296 [The point of expected failures]

    For the Eddybo mention:
    (720*3400/8)/1000
    KRPMs = 306 [This exceeds the 296 limit]

    So, it's not RPMs(or the energy to produce them) causing your failures.
    Thanks for the info.
    I am thinking that the Berger in 7mm 180gr. is coming apart on me due to the fact that on a few shots taken that the only thing hitting the paper target at 200yds. is shrapnel!!! I have 206 rounds down the barrel now and this has happened 3 times.
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    Last edited by RH300UM; 08-14-2011 at 11:00 AM. Reason: more info
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      #5  
    Unread 08-14-2011, 11:09 AM
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    Re: Berger Integrity

    If you don't have a borescope, a local gunsmith probably does. I'd have the bore/crown looked at. It's hard to guess at, so that's just where I'd start.
    If there is an issue there, you might salvage the situation with a going of Tubb's FinalFinish.
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      #6  
    Unread 08-14-2011, 03:23 PM
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    Re: Berger Integrity

    Quote:
    Originally Posted by Mikecr View Post
    If you don't have a borescope, a local gunsmith probably does. I'd have the bore/crown looked at. It's hard to guess at, so that's just where I'd start.
    If there is an issue there, you might salvage the situation with a going of Tubb's FinalFinish.
    Not sure as to what you are thinking????
    This is a new rig with a Brux barrel.
    Called 'smith. Was told to try a differnt lot of Bergers.
    The ones I was using were in the old yellow box. Thinner jacket?
    Might be as simple as this.
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      #7  
    Unread 08-14-2011, 04:07 PM
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    Re: Berger Integrity

    The new 'Match Target' VLDs have thicker jackets than the original VLDs(now called 'hunting' VLDs). This might work around whatever issue there is, at a cost of killing efficiency. But I don't think it's the bullets.

    Are you sure it's a 9tw, and not an 8tw?
    Have you checked the twist with a cleaning rod?
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