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My Berger 7mm hybrid BC test

 
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  #1  
Old 08-18-2010, 08:48 PM
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My Berger 7mm hybrid BC test

Hi guys I bought some berger hybrids 180gr bullets with a G7 BC of .345 and I decided to run some tests on them at semi lomg range 625 yards to see if they would get that BC. I have a Hoover metplat trimmer and poining die, so I sort 150 bullets and there is .002" variance at the ogive, pretty good so far. I start to metplat trim them about .005" and then point them. So if theory is correct I should loose about 2% BC and gain lets say up to 8% BC, so were 5% gain on BC which would bring the BC of this bullet up to G7.362 BC.
Well I shot them out to 625 yards and was low about 1.5 MOA, so I come back look at my speeds from my chrono at 12ft and decide to put a chrono at 200 yards to see what speed I am getting out there. Then I run those numbers with my 2 average velocities and I come up with my ne BC for these 180gr hybrid Bergers and I am a little off Bergers numbers.
The BC I got was .327, so it seems they are not as high as I thought.
Has anyone seen the same thing with these bullets?
But as far as acurracy they are pretty good if I do my part and the conditions are good, i get Half MOA or less at 200yards.
And when I shot at 625yards the bullets went through a quarter inch of steel like it wasnt there. So I think it should be a good hunting bullet. I shoot a 7mm Dakota caliber, Stiller predator action, with a 24.5" Rock barrel 8.73 twist and my load is 74.5grs Retumbo seated .015" off the lands and I am getting 2979 fps avg with low es and sd numbers.
Let me know if what I did was the right, as I am pretty new to long range shooting.
Thanks
Elmer
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  #2  
Old 08-20-2010, 10:10 AM
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Join Date: Dec 2009
Location: South Central PA
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Re: My Berger 7mm hybrid BC test

I would say that the modifications that you did to the bullets may have had some impact. I have heard that trimming the meplat will reduce by 2% but i have not herd of any process that will up the BC by 8%. That being said normally companys up the numbers a little to make them look better thats why its always a good idea to check your drops at the ranges you will be shooting at and dont trust the ballistic calculators except to get you close.
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Old 08-21-2010, 08:17 PM
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Re: My Berger 7mm hybrid BC test

Is this the HPBT 180 or something new???
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  #4  
Old 08-28-2010, 08:07 AM
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Posts: 147
Re: My Berger 7mm hybrid BC test

Quote:
Originally Posted by coyotezapper View Post
Is this the HPBT 180 or something new???
No it is a new bullet design it is that combines 2 types of ogives.
Elmer
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  #5  
Old 01-12-2011, 02:56 PM
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Join Date: Aug 2008
Location: E. TN
Posts: 87
Re: My Berger 7mm hybrid BC test

Per pointing 180 hybrids:

In conversation with Litz of Berger bullets told me that while pointing bullets helps smaller caliber bullet significantly more than larger cal bullets (it's a bullet diameter to point (meplat) diameter ratio thing) the 180 hybrid is an exception because the manufacturing process of this particular bullet leaves it with a larger than normal meplat for the bullet's size. He told me pointing the 180 hybrid would give it about an 8% increase in real world BC.....
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  #6  
Old 03-07-2011, 05:37 PM
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Re: My Berger 7mm hybrid BC test

Does that mean that you don't trim the bullets first?
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  #7  
Old 04-27-2011, 03:30 PM
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Location: Hawkes Bay New Zealand
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Re: My Berger 7mm hybrid BC test

Our results so far with the 180gn Hybrid have given us an average G7 BC to 1000 yards of over .340. This was in an extremely skinny fluted barrel we were testing that definitely seems to produce more yaw over the first 100 yards or so. Its a 26" no.3 (depending on who's contours you're quoting) measuring .600" at the muzzle, chambered in the 7mm FatMax (the new 300 Norma necked to 7mm, and fits in a modified short 700 Remmy) producing over 3300fps at 65,000 psi. We got an average of .335 G7 to 600 yards, so they certainly are settling into a pretty good BC to achieve .341 G7 average to 1000 yards. Accuracy at long range has been superb with almost no vertical at 600 and 1000 yards.
More testing in other calibers shortly.
Greg
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