Applied Ballistics - interesting info on Berger 156 EOL B.C.

[codyadams]

The other day, the Applied Ballistics app told me that they had updates on bullets, including bullet profiles for the Berger 156 EOL. I already had a profile built off of the Berger info, but when I used the Applied Ballistics bullet profile for the 156, I noticed something different.

The Litz numbers for the 156 EOL are a G7 of .355, and a G1 of .693, vs the Berger numbers of .347 G7 and .679 G1.

This isn't a massive difference for practical hunting purposes, I just thought it was interesting information. The comparison of the two profiles is as follows -

1000 yds
10mph 3 o'clock wind
Baro of 23.5
temp of 50
156 EOL @ 2916fps

Berger profile -
UP - 21.75
RIGHT - 3.25 or 34.02 inches
impact speed - 1924 fps
impact energy -1282 ft-lbs

AB profile -
UP - 21.5
RIGHT - 3.0 or 31.41 inches
impact speed - 1944 fps
impact energy - 1309 ft-lbs

So that equates to about 2.6" less drift and drop, 20 ft-lbs more energy, and 27 fps faster. For all practical purposes, negligible, other than the differences in impact, but that is why prior to shooting that far we must validate trajectory.

Anyway, I digress. Good shooting everybody!!!!

 

[jasonco]

Hmmm can confirm. Every little bit counts!

 

[shawnb]

I started a thread about a similar subject while shooting 225 eldm bullets. Within 1250 yards there was a negligible difference, about 0.1mil.

I started working my way out to 1910 yards and there is definitely a bigger difference. Whats your spread look like if you were to shoot 1 mile?

 

[codyadams]

I started a thread about a similar subject while shooting 225 eldm bullets. Within 1250 yards there was a negligible difference, about 0.1mil.

I started working my way out to 1910 yards and there is definitely a bigger difference. Whats your spread look like if you were to shoot 1 mile?

Like this

 

[codyadams]

Half MOA at that range is a little more, 9.25" approximately, enough to matter.

Btw I messed up, the first one is using that the applied ballistics custom drag model, a .355 G7 BC looks like this

 

[shawnb]

Well thats not bad. A lot less than my 1.3mil difference.

Thanks

 

[whirlwindjml]

The other day, the Applied Ballistics app told me that they had updates on bullets, including bullet profiles for the Berger 156 EOL. I already had a profile built off of the Berger info, but when I used the Applied Ballistics bullet profile for the 156, I noticed something different.

The Litz numbers for the 156 EOL are a G7 of .355, and a G1 of .693, vs the Berger numbers of .347 G7 and .679 G1.

This isn't a massive difference for practical hunting purposes, I just thought it was interesting information. The comparison of the two profiles is as follows -

1000 yds
10mph 3 o'clock wind
Baro of 23.5
temp of 50
156 EOL @ 2916fps

Berger profile -
UP - 21.75
RIGHT - 3.25 or 34.02 inches
impact speed - 1924 fps
impact energy -1282 ft-lbs

AB profile -
UP - 21.5
RIGHT - 3.0 or 31.41 inches
impact speed - 1944 fps
impact energy - 1309 ft-lbs

So that equates to about 2.6" less drift and drop, 20 ft-lbs more energy, and 27 fps faster. For all practical purposes, negligible, other than the differences in impact, but that is why prior to shooting that far we must validate trajectory.

Anyway, I digress. Good shooting everybody!!!!

So what b.c. did you run with? I was shooting 700 yard at 12" plate. Shooter called for 11.1 moa. It took 12moa to hit. I used labradar for 3218 average.

I shot at 1442 and it took 33 moa. I reversed the data in the app and it gave me a speed of 3219 based on the g7 .347 so I'm wondering about fiddling with a multi step g1 b.c. like I have my 300 otm using.

Thanks

 

[codyadams]

So what b.c. did you run with? I was shooting 700 yard at 12" plate. Shooter called for 11.1 moa. It took 12moa to hit. I used labradar for 3218 average.

I shot at 1442 and it took 33 moa. I reversed the data in the app and it gave me a speed of 3219 based on the g7 .347 so I'm wondering about fiddling with a multi step g1 b.c. like I have my 300 otm using.

Thanks

I ran the AB bc, .355, for a little bit and it worked fine. I switched to the AB custom drag model, it also worked fine. However, lots of things play into actual observed field drop, scope tracking/adjustment, geographical conditions, even different barrels will cause the bullet to have varying bc's, so field drops are the true test, at least for a particular rifle

 

[whirlwindjml]

I ran the AB bc, .355, for a little bit and it worked fine. I switched to the AB custom drag model, it also worked fine. However, lots of things play into actual observed field drop, scope tracking/adjustment, geographical conditions, even different barrels will cause the bullet to have varying bc's, so field drops are the true test, at least for a particular rifle

Yes..I've been lucky to many times. This one's accurate but not lining up midway.

Thanks

 

[highdrum]

Reviving an old thread with some new observations. My new 156s have 0.030 longer base to ogive, produce more pressure in barrel. Also AB revised their g7 to 0.337, my rifles a 7.75tw and in running them at 3000fps, and g7 drops are right ar 0.340 at 660 and 830y. Box BC still states 0.347g7. These newer bullets aren't what the older lots from 3-4 years ago were.