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Published vs. Actual Ballistic Coef.?

 
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  #1  
Old 06-05-2005, 07:30 AM
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Published vs. Actual Ballistic Coef.?

Seems like a read somewhere here or at longrangehunting last year some threads about true ballistic coef. vs. those published by the bullet manufacturer.

Will someone please tell me what the TRUE BC is for the following bullets? I'm told BC is variable based on velocity too, but given the same speed per caliber/rifle, I'm trying to establish which of the bullets listed has the highest. Is there an absolute favorite bullet among many of you for your long range hunting? 700-1000 yards?:

.270:

140 Nos Accub.
130 TSX
150 Nos Btip
130 Nos Btip
130 Swift Scirocco

.30 cal:

165 Swift Scirocco
180 Swift Scirocco
150 S. Scirocco

168 TSX
180 TSX
200 Nos. Accub.
165 Nos. BTip
180 Nos. BTip

7mm:

150 Swift Scirocco
160 Nos. Accub.

I know I listed a lot but someone who has done extensive tests has posted some before, I just cannot remember where.

Thanks!
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Old 06-05-2005, 10:37 AM
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Re: Published vs. Actual Ballistic Coef.?

Derek M,

Of the bullets you listed Here are the ones I would say produce the highest BC for a given velocity:

270

150 gr Ballistic Tip

308

200 gr Accubond

7mm

160 gr Accubond

To get the exact ballistic coefficents, the only best way to get an accurate BC is to put the bullets in the air in your shooting conditions.

There are better extreme range bullets out there then the ones you listed but of the ones listed I would say these three would produce the highest BC potential.

Good Shooting!!

Kirby Allen(50)
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  #3  
Old 06-05-2005, 10:47 AM
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Re: Published vs. Actual Ballistic Coef.?

Ok, please tell me your favorite long range hunting bullets.
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Old 06-05-2005, 08:34 PM
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Re: Published vs. Actual Ballistic Coef.?

Derek M.

Not sure this will help you much but here are my favorite long range hunting bullets:

257
156 gr ULD RBBT Wildcat BC 0.820

270
169.5 gr ULD RBBT Wildcat BC 0.750

338
300 gr ULD RBBT Wildcat BC 0.810

If you want more information on these bullets contact Richard Graves at wildcatbullets@hotmail.com

By the way, only the 300 gr 338 bullet will work in a standard factory twist. I load my 257 Allen Mag and 270 Allen Mag with the other two bullets to 3365 fps and 3400 fps respectively.

Good Shooting!!

Kirby Allen(50)
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Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

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allenmagnum@gmail.com
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  #5  
Old 06-05-2005, 09:54 PM
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Re: Published vs. Actual Ballistic Coef.?

Wow. Ok, so what twist do I need for the 270 bullets and barrel length? I am getting ready to have 2 more rifles built and am up for suggestions.
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Old 06-05-2005, 10:39 PM
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Re: Published vs. Actual Ballistic Coef.?

Been shooting a 270 Win with 140 gr Hornafdy and 130 Nosler ballistic tips. Don't know what actual vs published BCs are. After developing a drop chart (actual shooting every hundred yds out to 500 yds) it doesn't make any difference.

Was busting 1 gallon milk jugs at 650 yds on a regular basis.

Richard Graves sent me some prototype 168 gr RBBTs just to see if they will stabilize at Win velocities and 10" twist. (Just a fun experiment). They sure a good looking suckers. Way too heavy for the 270 Win even though I have a 27" Lilja bbl. Velocity won't be much. Now if it were a 270 Allen Magnum it would be the 220 Swift of the larger cal world.
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  #7  
Old 06-06-2005, 07:49 AM
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Re: Published vs. Actual Ballistic Coef.?

What is a 270 Allen Mag? What is it "close" to with respect to comparison? Is it a necked down big magnum?
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