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7mm reload problems (ballistics)

 
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  #1  
Old 06-13-2010, 08:50 PM
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Join Date: Jul 2009
Location: Idaho
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7mm reload problems (ballistics)

I have a load for my 7mm rem mag that shoots good
but my velocity is reall low acording to the bc calulator on best of the west web site
Im using 61 grains of rl 22 pushing 160 gr accubonds At 500 yards I have to come up 38 clicks. (9.2 Moa)
according to the BC calc im running 2595 fps according to nosler load data I should be up aroun 3000 fps
What am I missing here?
I used the correct scope height but does a 20 moa base affect that?
retiredcpo
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  #2  
Old 06-13-2010, 09:34 PM
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Re: 7mm reload problems (ballistics)

What is your zero distance?
What altitude are you shooting at?
What was the temperature?

Stu.
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  #3  
Old 06-13-2010, 09:48 PM
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Re: 7mm reload problems (ballistics)

Stu
Sorry
The gun is zeroed at 200 yards the alt is right at 2500 ft
and it was 67 degrees out the time.
I get one ragged hole at 200 with this load so I dont really want to change it but with the low speed comes bigger drop ect
I am also leary of increasing the load accrding to my reload books and accurate the max load is 65 grs but according to nosler the max load is 63 gr two grain differance
I really dont want to push the pressure to high
retiredcpo
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  #4  
Old 06-13-2010, 09:58 PM
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Re: 7mm reload problems (ballistics)

Using my ballistic programs I get exactly the same MV as you.

For what it is worth I am using 72 gr H1000 with 160 accubond, federal brass, federal 215 primer, proj just on the lands, getting 3067 fps.

Stu.
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  #5  
Old 06-14-2010, 04:56 AM
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Location: Carlisle, PA
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Re: 7mm reload problems (ballistics)

I'm using 68.5g of RL25, Win Brass, 160g AB seated 0.020" off the lands, FED215, getting 3022 fps out of a 26" barrel (chronograph average for 6 shots) into 1/2 MOA. QuickLoad predicted 2999 fps, measured 3022.

Fitch

Last edited by Fitch; 06-14-2010 at 05:01 AM. Reason: Added barrel length.
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  #6  
Old 06-14-2010, 06:50 AM
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Re: 7mm reload problems (ballistics)

fitch
thats what i3 bothering me about my load
your load data is real close to the mv you are getting
my load data says I should be up around 2963 allmost a 400 fps differance
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  #7  
Old 06-14-2010, 07:17 AM
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Re: 7mm reload problems (ballistics)

Quote:
Originally Posted by retiredcpo View Post
fitch
thats what i3 bothering me about my load
your load data is real close to the mv you are getting
my load data says I should be up around 2963 allmost a 400 fps differance
I have had similar experiences. With the 55g NBT load data for a .243Win I am about 400 fps under what Nosler predicts in their manual. Can't explain it. With other loads in their manual I'm right on.

I bought QuickLoad as part of trying to understand that experience.

Fitch
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