Determining Caliber Coefficient (Not Ballistic coefficient)

[PRCslut]

Hey everyone, I am wondering how you can determine caliber coefficient. Not to be confused with ballistic coefficient though bc is required to determine this. The CC is a number derived from the bc and the caliber your are shooting.

I may not be calling it by the correct name. It’s part of the wind deflection calculation.
RC x (WS/CC) x WV = #MRAD x 3.438 = #MOA

So for your CC for a .308 win in this 4
A 300 win mag would be 5

What’s the formula to determine the CC for different calibers. Please provide the forms and an example.

 

[Taylorbok]

what?......

 

[Gemsbok]

Yea...not super clear what all the abbreviations mean.
The resultant angle being used for wind deflection?
Maybe "WS/CC" = "Wind speed/caliber coefficient" RC = radial correction? (that's a wild ass guess).
That looks like a variation on the Gun MPH wind number, just less useful in the delivery.
Try this instead: https://www.snipershide.com/precision-rifle/gun-mph-wind-bracket-rose/

 

[PRCslut]

Yea...not super clear what all the abbreviations mean.
The resultant angle being used for wind deflection?
Maybe "WS/CC" = "Wind speed/caliber coefficient" RC = radial correction? (that's a wild ass guess).
That looks like a variation on the Gun MPH wind number, just less useful in the delivery.
Try this instead: https://www.snipershide.com/precision-rifle/gun-mph-wind-bracket-rose/

 

[PRCslut]

RC = range coefficient (100m=.1, 200m =.2 300m = .3 etc)
WS is windspeed
CC is caliber coefficient
WV is wind value like from a shooter clock.

I took a course by an x sniper that had the longest confirmed kill at one time in Afghanistan and this the wind correction formula he taught

 

[XLR308]

Um, yeah, no

 

[Taylorbok]

You should ask for your money back.

 

[Bacarrat]

Is this some made up the OP is talking about?

 

[PRCslut]

You guys should actually try it before shitting on it. And also help me with what I’m looking for. It works very well.

 

[Taylorbok]

You guys should actually try it before shitting on it. And also help me with what I’m looking for. It works very well.

You should try a ballistic calculator, it works really good.

Like I said in the other thread, it's possible to make impacts at closer distance using some of these hand math techniques but it falls apart at ELR distances.

 

[rlsmith1]

I thought this would be a good way to quantify the difference in performance at a given distance if you are trying to compare a higher BC, slower projectile (like a 147 ELD from a 6.5 CM) against a faster, lower BC projectile (like a 108 ELD from a 6 CM). Always balancing speed, BC, and recoil...

But I don't understand in the least what OP is trying to do

 

[Tx_Aggie]

I thought this would be a good way to quantify the difference in performance at a given distance if you are trying to compare a higher BC, slower projectile (like a 147 ELD from a 6.5 CM) against a faster, lower BC projectile (like a 108 ELD from a 6 CM). Always balancing speed, BC, and recoil...

But I don't understand in the least what OP is trying to do

It looks like Cartridge Coefficient is the same as gun number. 4mph is a pretty typical gun number for a 308.

500yds (so an RC of .5), 6mph wind, 70% value, "308 with CC of 4"

.5 x (6/4) x .7 = .525 mils

OP (@PRCslut), check out this video, this is how most folks are finding a specific gun number (or wind number, cartridge coefficient, whatever) for their specific rifle & ammo:



You will need to chrono your rifle and then build a profile in a ballistic solver (AB Quantum, 4DOF, Strelok, etc) to accomplish this.

 

[Emerson0311]

RC = range coefficient (100m=.1, 200m =.2 300m = .3 etc)
WS is windspeed
CC is caliber coefficient
WV is wind value like from a shooter clock.

I took a course by an x sniper that had the longest confirmed kill at one time in Afghanistan and this the wind correction formula he taught

A Furlong course?

 

[Taylorbok]

A Furlong course?

Any of the courses I've heard that Furlong runs is all on a Kestrel.

 

[Mike Casselton]

If you're using furlongs, do the hand measurements go in halves, quarters or tenths?

 

[Aftermath]

If you're using furlongs, do the hand measurements go in halves, quarters or tenths?

If you only use one hand, a finger is 1/5 or 2/10 of a hand.
That changes if you are using both hands though where a single finger is 1/10 of a hand.
In either case, a finger is roughly equivalent to 15 minutes...of time.

 

[Mike Casselton]

Are thumbs fingers?
Remember, not all fingers are thumbs.

Hands also have other units of measure.
Equine stuff

 

[Mumzergadol]

The answer is purple 5

 

[HMRamateur]

I know that formula. Definitely a furlong course.

There are simpler ways to figure out your wind call, even though that formula does work. Finding your rifle MPH number is much simpler. Then multiply it by the number for your wind angle will put you in the same ball park. Less math to do on the fly while shooting.

Can't deny Furlong isn't a good shooter, he's proven himself in combat already. I feel like he's a little behind the times on some stuff though. If you really want to continue to use that formula, you'll probably just have to test different caliber coefficient numbers for the cartridge you're using. I've only used it for 6.5cm and .223, and using 6 and 4 respectively seemed to work, which also pretty much lines up with the first number of the BC of your bullet (which iirc that's how he explains where to generally find that number).

 

[babyguppy]

Is OP looking for something like this?