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bullet BC

 
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  #1  
Old 10-05-2007, 01:55 PM
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bullet BC

These are common bullet BCs from an old post. Anyone have more current info and updates post them

6.5 Caliber
Sierra 142 .595@2850
Berger 140 .633@2240
JLK 140 (B) .630
Clinch River 147 _____
AMAX 140 .618@2400
Cauterucio 141 .630

7mm Caliber
JLK 168 .690
JLK 180 .738
Sierra 168 MK .636
Cauterucio 156 .615
Cauterucio 176 .750
Berger 168 .648
Berger 180 .738
AMAX 162 .625
Nosler 140 BT .488

30 Caliber

Sierra 168 MK .462
Sierra 180 MK .475
Sierra 190 MK .565
Sierra 200 MK .600
Sierra 220 MK .655
Sierra 240 MK .711
Sierra 200 GK .597
Barnes 180 TSX .428
Barnes 180 XLC .498
Barnes 180 MRX .459
Berger 168 .512
Berger 175 .537
Berger 185 .569
Berger 190 .583
Berger 210 .640
JLK 190 .602
JLK 210 .665
AMAX 168 .475
AMAX 178 .495
Cauterucio 190 ____
Cauterucio 210 ____
Clinch River 216 ____
Hornady 180 SST .481
Lapua Scenar 155 .508
Swift Sciroco 180 .547
Nosler Accubond 200 .538


338 Caliber

Sierra 250 MK .565
Sierra 300 MK .797
Hornady 225 SST .526
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  #2  
Old 10-05-2007, 05:35 PM
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i use .59 for the 338/250 Sierra MK

things a little slow down in Va.?
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  #3  
Old 10-05-2007, 07:40 PM
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Berger BCs

All of our BCs are listed on our website at Berger Bullets under the Products heading on the bullet pages. You can also request that we mail to you a brochure which lists all of our updated BCs. Call Andrea Cobos at 714-447-5456 or email her at andrea.cobos@bergerbullets.com.

While your asking for the brochure be sure to request our 30 minute Hunting with Berger VLD video which shows kill after kill while listing the cartridge, velocity, bullet and distance.

Regards,
Eric
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  #4  
Old 10-05-2007, 09:07 PM
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I found the Berger BC on the 168 VLD .284 cal to be .63 to match my data when running it out to 1000 yards.
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  #5  
Old 10-05-2007, 09:09 PM
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The BC for the 7mm 168gr SMK is about .490, I think the 175 SMK is closer to .630.

Wayne aka WAMBO
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  #6  
Old 10-05-2007, 09:21 PM
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Quote:
Originally Posted by WAMBO View Post
The BC for the 7mm 168gr SMK is about .490, I think the 175 SMK is closer to .630.

Wayne aka WAMBO

Yup, I run .494 for 168 and .608 for the 175 @ 2400 fps.
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  #7  
Old 10-06-2007, 12:28 AM
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I have also experienced, like many, almost always when using VLD type bullets, SMK, etc., the BC that we need to use for long range will need to be higher than the published BC; this is because by using published BCs at ranges longer than about 500 yards, we usually have points of impact higher than what the drop table is telling us. As we know, to fix it we have to kick the BC up until we come up with a higher number to match our impact point at longer ranges telling the ballistic application that our bullets fly flatter than what the application is telling us. The reason is that most ballistic programs use the G1 BCs with the G1 drag model which is for flat base spitzer type bullets. This model if far from fitting the VLD type bullets. Other applications atemp to make the G1 model fit the G5 and G7 models which fit the VLD better, but at best they just get a bit closer. That's the reason I like LoadBase 2.0, because it's unique in its ability to use G1 ballistic coefficients which are widely available but yet it does not use the G1 drag model, instead it will do complicated calculations to create internally a model for the specific bullet that's coming out of your rifle. The thing is to collect four velocities at different distances using a good chronograph, weather conditions, and let the program do its thing. It will calculate a BC with a Drag value that will allow you basically to have a custom model for your very own bullet.
I have yet not been able to collect those velocities but I have done other tricks that have allowed my drop tables to be closer than ever before.
I hope I did not bore you guys to death!
I almost forgot my main reason to post, LoadBase 2.0 has in its data base 2945 bullets ranging from BC = 0.026 to BC = 1.095 including info like: Manufacturer, bullet type, bullet name, stock #, Bullet diameter, bullet caliber, bullet length and bullet weight.
No, I'm not a salesman for Patagonia Ballistic nor I'm receiving commissions, but maybe I should. Ha? :confused:
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Last edited by Eaglet; 10-06-2007 at 12:44 AM.
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