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243win/95 bergers drops

 
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  #1  
Old 07-26-2013, 04:36 PM
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243win/95 bergers drops

Ok so rifle is Rem 700 varmint with 26" barrel. Ammo is hand loads I had from another rifle and have lost all load data. My chrony is broke so I shot two different 3 shot groups at 480 yards. Both held 3" group with vertical variance only 1/2". With 100 yard zero, 2" scope height, temp was 80* 54% humidity and elevation of 800 feet. What's puzzling me is groups only dropped 24-1/2". When run through ballistic program I have to use a 3550 fps velocity? That seems really high to me. Using .48 for BC what am I doing wrong?
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  #2  
Old 07-26-2013, 07:30 PM
wbm wbm is offline
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Re: 243win/95 bergers drops

Just a guess but probably the parallax on your scope.
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  #3  
Old 07-26-2013, 08:34 PM
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Re: 243win/95 bergers drops

Use a G7 BC instead of a G1 it is more accurate.
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  #4  
Old 07-26-2013, 08:39 PM
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Re: 243win/95 bergers drops

Using a 0.246 G7 BC the numbers look very close to my own. Are you sure there was not a slight slope involved ?
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  #5  
Old 07-26-2013, 11:28 PM
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Re: 243win/95 bergers drops

If I use the data from my .243 profile (these are confirmed several times) I come up with 44.16" or 9.2 MOA. I am shooting the 95 grain bergers @ 2790 fps with a 24" barrel (I know its slow). So if your running things hard and a 26" tube you should be around 3000fps, which would give you about 7.5 MOA or 36" of drop.

I think you may have mis-measured you drop or possibly your scope height. 2" is usually high rings though.
If I had to bet, I would say probably something with your scope set up.
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  #6  
Old 07-27-2013, 07:52 AM
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Re: 243win/95 bergers drops

My setup is a 26" Shilen select match with 1:8 twist 243 AI chamber. But the numbers I posted are shooting virgin 243 brass with 41gr of H100V powder, in other words my "fireforming" load. My loads are to sami OAL spec of I believe 2.71".

When the brass is fireformed and loaded the second time I am loading them with 105gr bergers and am still doing load development on that one. I have not yet found the optimum jump for that bullet, nor the ideal powder load.
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  #7  
Old 07-27-2013, 09:34 AM
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Re: 243win/95 bergers drops

Quote:
Originally Posted by westcliffe01 View Post
My setup is a 26" Shilen select match with 1:8 twist 243 AI chamber. But the numbers I posted are shooting virgin 243 brass with 41gr of H100V powder, in other words my "fireforming" load. My loads are to sami OAL spec of I believe 2.71".

When the brass is fireformed and loaded the second time I am loading them with 105gr bergers and am still doing load development on that one. I have not yet found the optimum jump for that bullet, nor the ideal powder load.
What is a 243 Ai chamber? Do you always need a faster twist than 1-10 to shoot 95Gr VLD?
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