Coefficient of round balls

[greysmoke]

Why the heck is it so hard to find a simple answer to the question "whats the ballistic coefficient of a .54 or .50 round ball?" When I google it I find nothing or a bunch of discussion about what's ballistic coefficient, etc. I just want a number to plug into various apps to find wind drift, etc.

 

[azmntman]

Dan?

 

[George]

.530 ball BC = .0748
.490 ball BC = .069

Spence

 

[galamb]

From the Lyman manual:

.310/45 grain = .043
.350/65 grain = .049
.440/128 grain = .062
.490/177 grain = .068
.495/182 grain = .070
.535/230 grain = .075
.570/276 grain = .080
.690/494 grain = .086
.715/545 grain = .097

 

[George]

True BC is obtained only by firing and measuring, but an approximation which works well enough for our purposes is simple to calculate.

BC = Ball Wt. in grains divided by (10640 x ball dia. x ball dia.)

So, for your .530" ball which weigh 223.54 grains,

BC = 223.54 ÷ (10640 x .530 x .530)
BC = 223.54 ÷ (10640 x .2809)
BC = 223.54 ÷ 2,988.776
BC = .0748

This link has some useful BP math, for the time being, but it's going away soon.
http://home.insightbb.com/~bspen/math.html

Spence

 

[George T.]

They are slightly better than a house brick. They will raise a whelp on you though!

Geo. T.

 

[Stumpkiller]

The Coefficient of Friction between dry lead and cast iron surfaces is 0.43 with sliding force.

Aren't you glad you read down this fer?

 

[necchi]

This link has some useful BP math, for the time being, but it's going away soon

Awh Geez, I've had a link to the Notebook for years!!
Really helped me cut through to the chase when I started shotgun :thumbsup:

 

[ravenousfishing]

Yea, but with a PRB, the dry lead doesnt touch the iron.

 

[1100 Remington Man]

Great info. Thanks also.

 

[Rifleman1776]

"whats the ballistic coefficient of a .54 or .50 round ball?" When I google it I find nothing

That's because muzzle loaders don't do 'rithmatic.
Ye load it and ye shoot it. No calculator needed.

 

[Wes/Tex]

This link has some useful BP math, for the time being, but it's going away soon. http://home.insightbb.com/~bspen/math.html
Spence

OH...say it ain't so...especially if you mean the whole site! Too great a resource to my way of thinking! :thumbsup:

 

[greysmoke]

Thanks everyone. I knew I could count on this forum!

 

[tenngun]

"whats the ballistic coefficient of a .54 or .50 round ball?" When I google it I find nothing

That's because muzzle loaders don't do 'rithmatic.
Ye load it and ye shoot it. No calculator needed.

" Said the rabbit in the pot 'twas not a good shot it was ballistic coeffcent put me in the pot'. And the coon said 'Im a hat on his head cause I sipmply forgot about fine alloyed lead.' The deer said quit saddly 'my insides were wrecked by ballistic co-eefencent and colloris effect' and legions of redcoats with thier muskets and gear all shoke thier heads and agreed with the deer' twas not through skill or bad luck we encontered deaths path but simply because the guy knew his math"

 

[azmntman]

:rotf: :rotf: :rotf: :rotf: :rotf:

 

[David W.]

My, you're gullible!

Thanks everyone. I knew I could count on this forum!