BC Makes Up For A Whole Lot!!!!

[bullet]

BC of the 150gr E-Tip sure makes up for a lot. My accurate hunting load I have been using is with a 165gr Sierra HPBT moving on average at 2973fps.

Now this 150gr E-Tip I have loaded is moving 2895fps and BC does make a difference!!!! When BC causes a 150gr bullet to out perform down range over a 165gr bullet moving on the average 78fps faster, BC becomes important.

150gr E-Tip at 300yds is -4.84" with 1801 pounds energy and -17.2" at 400yds with 1542 pounds energy and -66.52" at 600yds with 1111.5 pounds of energy.

165gr Sierra HPBT at 300yds is -4.61" with 1823 pounds of energy and -18.06" at 400yds with 1477 pounds of energy and -73.04" at 600yds with 949.8 pounds of energy.

 

[Powerstroke]

bullet,

You're so correct on that. It's amazing to see the acutal results of that. I never quite understood what a drastic difference that made unti I started playing with the 6.5mm's
I posted this on another thread, but this is a great example
Left to right
200gr / 30cal , 140gr / 7mm both A-bonds then the 130gr / 6.5mm VLD can you say B.C. ?? :grin: Berger "claims" .595 on that one....

 

[Antelope_Sniper]

BC also helps buck the wind. It actually make more difference then bullet weight.

 

[old #7]

High bc's are why I like the .284 cal line of bullets especially out of a 280ai.

 

[bullet]

High bc's are why I like the .284 cal line of bullets especially out of a 280ai.

The .284 does have some very High BC for sure.

 

[JD338]

I concur. The very reason I am shooting the 160 gr AB (.531 BC) in my 280 AI and 250 gr AB (.575 BC) in my 338 RUM.

JD338

 

[FOTIS]

Bullet did you check actual drop?

 

[bullet]

Bullet did you check actual drop?

No, I only checked drop from 2 1/2" high at 100yds drop.

 

[FOTIS]

Bullet did you check actual drop?

No, I only checked drop from 2 1/2" high at 100yds drop.

to what distance in real life?

 

[Guy Miner]

On my long-range rigs, those rifles I habitually shoot beyond 300 yards, I pay some attention to BC.

Running 210 gr Berger VLD's from a .300 WSM and 115 gr Berger VLD's from a .25-06 Rem rifle.

For my "normal" hunting ranges though, the high BC doesn't really make much difference, so I just select the bullet I want and leave it at that. For instance I chose the 175 Nosler Partition over the 175 Sierra SPBT Gameking for my 7mm Rem mag, despite the greater accuracy and higher BC of the Sierra. I wanted the terminal results of the Partition bullet... :grin: That was more important to me in that case than pure long-range efficiency.

FWIW, Guy

 

[FOTIS]

On my long-range rigs, those rifles I habitually shoot beyond 300 yards, I pay some attention to BC.


FWIW, Guy

ABSOLUTELY!


The only way to really know!

 

[bullet]

On my long-range rigs, those rifles I habitually shoot beyond 300 yards, I pay some attention to BC.

Running 210 gr Berger VLD's from a .300 WSM and 115 gr Berger VLD's from a .25-06 Rem rifle.

For my "normal" hunting ranges though, the high BC doesn't really make much difference, so I just select the bullet I want and leave it at that. For instance I chose the 175 Nosler Partition over the 175 Sierra SPBT Gameking, despite the greater accuracy and higher BC of the Sierra. I wanted the terminal results of the Partition bullet... :grin: That was more important to me in that case than pure long-range efficiency.

FWIW, Guy

With E-Tip it seems from the data that I will get both good terminal results and long-range efficiency, at least that is what I am hoping for because I will take a 400yd shot with my 06 if wind is down and I have a good rest.

 

[Guy Miner]

I strongly suspect you're right! :grin:

Haven't tried the E-tips myself yet. All of the other Noslers I've tried over the past 30+ years have worked just fine though.

 

[Ridge_Runner]

maybe its the velocity I drive them, maybe its my shooting conditions, but my tests have shown the 160 noslers have an actual BC of .62. this is shooting them from a 7mm Allen Mag at 3575 fps. and still showed some expansion with an impact velocity of 1575 fps. Though it was down to 960 fft/lbs of retained energy at 1350 yards it got the job done.
If I decide to try for a whitetail at 1500 yards I may switch to the 180 bergers to utilize its higher BC since I'm thinking shipments of 200 gr wildcats will be sporatic at best.
However, I have been contacted by a guy about some Henson aluminum tipped .284 bullets that have an ungodly BC.

BC WILL OUTRUN VELOCITY EVERYTIME!
JUST SWITCHING TO A HIGH BC
VLD CAN CUT YOUR DROP/DRIFT BY 30%

RR

 

[OldMan]

In order for Barnes to get the velocity up in their X bullets they cut some grooves which did help, but it also killed the BC. Why not do the same with the E-tip, but they could make the grooves more streamlined without the sharp edges of the cut! I believe Herters made a wasp-wasted bullet years ago. Nosler could get the best of both worlds with high velocity and high BC. How about one of those machinests out there try this!

OldMan

 

[Antelope_Sniper]

Ridge Runner, My experience with the 160 AB at around 3475 out of my STW is similar to yours. It seems to shoot a little flatter then the BC indicated, but probably not as good as you are experiencing. Sierra lists multiple BC for their bullets, and the BC will typically increase with the velocity.

 

[FOTIS]

Maybe not totally applicable but I remember the claimed BC of .505 on the Barnes 375 cal 270 grain X. Now it is recalculated to .326!

WOW!!!!!!!!!!!!!!