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.

 

[Mike Casselton]

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

Hands also have other units of measure.
Equine stuff