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My Berger 7mm hybrid BC test

 
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  #8  
Old 08-25-2012, 09:51 PM
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Location: Murray, Ky.
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Re: My Berger 7mm hybrid BC test

Hey Elmer, trying to revive this older thread. My custom 7mm Dakota will be here Monday and I plan on shooting the 180 hybrids. Just curious if you've tested any other powders with this bullet or if you stayed with the retumbo.

Thanks
Nathan
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  #9  
Old 08-26-2012, 04:25 PM
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Join Date: Jan 2007
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Re: My Berger 7mm hybrid BC test

Quote:
Originally Posted by nddodd View Post
Hey Elmer, trying to revive this older thread. My custom 7mm Dakota will be here Monday and I plan on shooting the 180 hybrids. Just curious if you've tested any other powders with this bullet or if you stayed with the retumbo.

Thanks
Nathan
Hi Nathan, I have shot H1000 with it out to 1000yards and its quite accurate but I think its more
temperature sensitive than the retumbo I'm using, shot both powders at 75 and 15 degrees and it seems that h1000 lost about 50fps in the change while retumbo was hardly noticable.
But I havent repeated the test if you'd I'll go into my notes and give you my findings.
Emler
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  #10  
Old 08-26-2012, 04:49 PM
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Re: My Berger 7mm hybrid BC test

Quote:
Originally Posted by elmerdeer View Post
Hi Nathan, I have shot H1000 with it out to 1000yards and its quite accurate but I think its more
temperature sensitive than the retumbo I'm using, shot both powders at 75 and 15 degrees and it seems that h1000 lost about 50fps in the change while retumbo was hardly noticable.
But I havent repeated the test if you'd I'll go into my notes and give you my findings.
Emler
If you don't mind pm me your loads you tried in retumbo and h1000 and also the primers you tried as well.

I appreciate your help, it's pretty hard finding info using this case and bullet. I sent you a pm on accurate shooter asking the same thing too.


Nathan
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  #11  
Old 08-26-2012, 04:51 PM
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Join Date: Jan 2007
Posts: 151
Re: My Berger 7mm hybrid BC test

Quote:
Originally Posted by nddodd View Post
If you don't mind pm me your loads you tried in retumbo and h1000 and also the primers you tried as well.

I appreciate your help, it's pretty hard finding info using this case and bullet. I sent you a pm on accurate shooter asking the same thing too.


Nathan
Np Nathan will send them to you later on tonight.
Elmer
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  #12  
Old 08-27-2012, 02:53 PM
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Re: My Berger 7mm hybrid BC test

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Originally Posted by elmerdeer View Post
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
Elmer, one thought. Are you using a BDC reticle or dialing a turret? It also could be that your scope may not be tracking correctly if you are dialing. I have run into this recently where the MV and B/C were right but drops on target were not coming out right. I did a scope tracking test at 100 yards. I fired two shots at the 100 yard dot, dialed up 10MOA and fired two, dialed up 20MOA and fired two and then finished off by dialing up 30MOA and fired two more. I measured from the first two shots at 100 with a tape up to the center of each of the pairs and was able to determine that the scope was undertracking explaining why my poi had been low. Just remember to use one inch plus 3/64 for each MOA you measure. Not 1". This is a very revealing test
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