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Berger vs sierra bt

 
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  #8  
Old 01-26-2009, 06:35 AM
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Re: Berger vs sierra bt

I am using the remington 700 boone and crockett gun. The barrel is a magnum contour that they fluted making it more like a sporter barrel which would probably cause that. Thanks a lot that makes a lot of sense
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  #9  
Old 01-28-2009, 11:54 AM
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Re: Berger vs sierra bt

I have seen that heavier bullets almost always hit higher, but I don't think it is a result of the barrel flexing as much as it the shooter flexing. I first observed it shooting a 44 mag pistol and the heavier bullets hit higher than the lighter by several inches at 100 yards. The heavier bullet is slower getting going and stays in the barrel longer and it leaves the barrel after you have been rocked back more by the recoil.

Try laying a sandbag over the barrel and see if it changes the POI. 5 1/2" is a lot more than I would have expected thou. Try it again at a longer distance and see if one of the bullets isn't flying wild. You may have something else going on, like under sized bullets. I know it is rare, but it has happened. By trying to make it repeat you may also find a scope loose or something.

Best of luck and let us know what you find.
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  #10  
Old 01-28-2009, 12:42 PM
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Re: Berger vs sierra bt

That much difference is certainly not one bullet shooting flatter than another.

Two factors would come in here, barrel whip and recoil. Your barrel moving will have a reasonably small effect at 80 yards, but more recoil and a very slightly slower bullet could have the gun recoiling just a bit more "up", shifting your groups that way.
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  #11  
Old 01-28-2009, 10:30 PM
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Re: Berger vs sierra bt

I will try the sand bag this weekend i am out of town now. I will try shooting at longer ranges also. When i had the crono out something funny happened. When i shot the sierra 160 bullet through it it went through without anything happening but when i shot the 168 berger it blew off all the back post and the white cover off. I saw that it had a lot more muzzle blast would that have anything to do with it?
Thanks ted
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  #12  
Old 01-29-2009, 05:57 PM
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Re: Berger vs sierra bt

I am guessing your barrel is not free floated. I have seen crazy points of impact changes on barrels with pressure points with different bullets. You will still get a point of impact change with a free floated barrel, but it will not be that extreme.
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  #13  
Old 01-29-2009, 07:40 PM
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Re: Berger vs sierra bt

maybe the bullet hit the back post holding the white cover and made it fly a bit off course?
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  #14  
Old 01-29-2009, 07:52 PM
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Re: Berger vs sierra bt

This seems extreme to me for 80 yards, but i would bet on barrel whip. It sounds like a light long barrel problem. I would not worry about it much. If either of them shoot in the same hole, use it and adjust the scope.

I have a Remington 700 ADL 308 that shoots 150 bullets dead on at 100yards while 165's were 2" high and 180's were 4" high and right about 1 2/3".
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