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One dead on and one always to the left?

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  #1  
Unread 10-23-2012, 03:11 PM
SMF SMF is offline
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One dead on and one always to the left?

I'm getting two points of impact from two different loads at the same range. A Berger 168 grain VLD at 2780 FPS is impacting 3/10ths of a mil left if 175 grain SMKs but vertical the same. Same weapon system, same support (sand bags), same shooter. I could understand a higher or lower point of impact but what would cause it the lighter faster bullet to shift to the left? Could it be that the VLD hasn't stabilized at 100 meters? I get the exact same results every time.


Thanks

Steve
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  •   #2  
    Unread 10-23-2012, 03:32 PM
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    Re: One dead on and one always to the left?

    how much is 3/10's of a mill at that distance ( in inches)??
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      #3  
    Unread 10-23-2012, 04:57 PM
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    Re: One dead on and one always to the left?

    Quote:
    Originally Posted by SMF View Post
    I'm getting two points of impact from two different loads at the same range. A Berger 168 grain VLD at 2780 FPS is impacting 3/10ths of a mil left if 175 grain SMKs but vertical the same. Same weapon system, same support (sand bags), same shooter. I could understand a higher or lower point of impact but what would cause it the lighter faster bullet to shift to the left? Could it be that the VLD hasn't stabilized at 100 meters? I get the exact same results every time.


    Thanks

    Steve
    I have had that happen over the years on several occasions and believe it to be a specific bullet or load inducing different barrel harmonics causing a different POI.
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    Unread 10-23-2012, 05:13 PM
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    Re: One dead on and one always to the left?

    Quote:
    Originally Posted by Greyfox View Post
    I have had that happen over the years on several occasions and believe it to be a specific bullet or load inducing different barrel harmonics causing a different POI.
    I've had the same experience with my .300 WinMag.
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      #5  
    Unread 10-23-2012, 05:17 PM
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    Re: One dead on and one always to the left?

    What Greyfox said. Bullet weight can be a significant change but any component change can move things around.

    .3 mils @ 100 yards is about 1.2 inches.
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      #6  
    Unread 10-23-2012, 05:20 PM
    SMF SMF is offline
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    Re: One dead on and one always to the left?

    Barrel harmonics, hmmm I didn't even consider that! That would certainly make sense. Thank you sir.

    Steve
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      #7  
    Unread 10-24-2012, 07:56 AM
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    Re: One dead on and one always to the left?

    That's not to be unexpected.

    One of my rifles shoots a Sierra 90 gr hp @3400 exactly 1/2" to the left of where it puts the 130 gr bullet.

    Easy adjustment when switching from hunting bigger game to varmints/predators.

    All my other rifles shoot one bullet weight.
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