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Could this be right?

 
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  #1  
Old 02-14-2012, 12:41 PM
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Could this be right?

I took my chrony out the other day to let my buddy shoot his 6.5-06 AI over it to check his velocities (averaged just under 3300). Afterward we zeroed the rifle at 200 yds and also shot it at 600 yds. I dont have my notes in front of me right now and don't remember the adjustment off the top of my head. Once we got it on at 600 yards, I went back to the house and entered the information in the Gseven program and came up with a G1 b.c. of .606! This seems extremely high for a bullet of this caliber and weight. I've read in several forums that the claimed b.c. of the 6.5 hornady sst and interbond were way underrated but to this extent? I was just curious what kind of numbers some of you guys with experience with these bullets were coming up with. I keep thinking I had to have entered something wrong in the program cuz .606 seems almost too good to be true...
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  #2  
Old 02-14-2012, 01:58 PM
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Re: Could this be right?

You didn't tell us which bullet you were shooting...
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  #3  
Old 02-14-2012, 02:21 PM
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Re: Could this be right?

Oops...no I didn't did I... He is shooting the 6.5mm 129gr Interbond.
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Old 02-14-2012, 07:57 PM
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Re: Could this be right?

129 SST BC is .483 so i would be doubtful the interbond is much better if any.
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Old 02-16-2012, 11:26 AM
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Re: Could this be right?

Quote:
Originally Posted by ZSteinle View Post
129 SST BC is .483 so i would be doubtful the interbond is much better if any.
I believe they are both pretty close, but I also believe they are both underrated at .483.

To the OP, can you confirm that your velocity is correct?
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Old 02-16-2012, 11:38 AM
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Re: Could this be right?

I had to have entered something wrong the first time. I went through all my data and ran the numbers again last night and came up with a G1 value of .505. Seems much more realistic to me. That's not too shabby for a 129 gr slug. I may give em a try in my .264wm when I get my scope. Looking at the numbers, it should outrun the 140 gr Accubond with a claimed B.C. of .509 (which has been stated by some to be overinflated).
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Old 02-16-2012, 11:39 AM
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Re: Could this be right?

more than likely your velocity reading is low which means your bc must be boosted to match your drops. thats why it looks like the BC is so high.
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