roundball BC

[GreyWhiskers]

New here. Need ballistic coefficient for .490 and .530 round balls

 

:snore: Old here . Are you one of those new fangled shooters that analyses things to death ?and grinds details to dust untill all the fun istaken out of a sport?

 

:v Did not mean to sound so contrite . But why sweat the detail of a balistic coefficient. It's lousy in a round ball anyway, all you have to remember is that in order to do a certain job a round ball must be of sufficient size to store enough kinetic energy to knock the game animal you are hunting ie., big animal big round ball small animal small round ball.

 

[sledgemeister]

:snore: Old here . Are you one of those new fangled shooters that analyses things to death ?and grinds details to dust untill all the fun istaken out of a sport?

ROFLMAO, The bang I heard wasnt a firearm was it? Must have been that door being slammed shut!
I know what you mean though.

 

[roo shooter]

The best I can find is .495 is .070,.535 is .075
I dont think to many hear worry about BC very much, more about ball and powder, getting the right load for the rifle and game.

 

[roundball]

New here. Need ballistic coefficient for .490 and .530 round balls

There's a couple of BP manuals published which I believe carry that kind of information...Lyman's Blackpowder manula is one that comes to mind...

 

:snore: Old here . Are you one of those new fangled shooters that analyses things to death ?and grinds details to dust untill all the fun istaken out of a sport?

I suspect he needs the data to plug into a ballistics program. No harm in that. It IS modern thinking, but we all are moderns aren't we?--and it is hard to get it out of our system. I agree with you that it is unnecessary with traditional ML BP arms, but if one is new at it a basis of comparison with one's modern arms is a good learning point and may help one limit his/her uses....

 

[jtmattison]

First off, welcome to the forum grey whiskers.
You will find a wealth of information on this site and a fine bunch of folks to help you out.

Second:

:snore: Old here . Are you one of those new fangled shooters that analyses things to death ?and grinds details to dust untill all the fun istaken out of a sport?

Lets not knock the new guys in the forehead for asking the very first question on the forum.
"old here"? It doesn't look like you've been here very long yourself.

Lets treat every question fairly and if you have a valuable answer then post a reply.

If you have nothing valuable to add to the thread then please don't post.

Thanks,
HD

 

[GreyWhiskers]

Just having fun with my ballistic program. Didn't see any BC values for roundballs.
Not new to muzzleloading but took a long vcation from it. :grin:

 

[AZ-Robert]

Are you one of those new fangled shooters that analyses things to death ?and grinds details to dust untill all the fun is taken out of a sport?

Well, it does help you work out your expected velocities, how much drop you can expect way out there at 100 yards, and how much energy will be left when it gets there. Useful stuff for someone who wants to "work up the right load" without taking a completely trial-and-error approach, and who wants to make sure there is enough energy left in the ball to take game cleanly -- trial-and-error there is usually frowned upon. As for taking the fun out of it, some folks enjoy playing with the numbers. who am I to judge what is fun for them? It's not like he is telling me I have to do it that way too.

Grey Whiskers, this will get you close enough as long as you are not looking at really low velocities:

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

Example using the .530 ball (224 grains) I use in my .54:

BC = 224 / (10640 x 0.53 x 0.53) = 224 / 2988.78 = 0.0749 ---> 0.075.

Since you need to know bullet weight to start, you'll need this too:

Round Ball Weight in grains = 1502.6 x (Diameter x Diameter x Diameter)

Example for a .530 roundball: W = 1502.6 x 0.53 x 0.53 x 0.53 = 223.7.

Both are just approximations, but good 'nuff. I think you might enjoy browsing this site:
[url] http://home.insightbb.com/~bspen[/url]/

 

[gmww]

New here. Need ballistic coefficient for .490 and .530 round balls

Lyman, Black Powder Handbook & Loading Manual, by Sam Fadala, page. 178, page 260.

.490"=.068 BC
.535"=.075 BC
:hatsoff:

 

[GreyWhiskers]

Mucho thanks for the info. Didn't realize it would be so controversial. :hmm: Will check out the site you included. Lon

 

[gmww]

I use the BC for my ballistics program so I can understand what the bullet path is going to be. Also it's nice to know how much energy any given bullet may have down range. Can be the difference of a dead animal or a wounded animal. :thumbsup:

 

[roundball]

Didn't realize it would be so controversial. :hmm:

And it shouldn't have been...sorry you experienced that

 

[GreyWhiskers]

Thanks for info. I'm going to get a chance to shoot at longer distances and want to check findings with my ballistic program. It may have no "practical" application, just curious. :grin:

 

[gmww]

I believe it was roundball that first mentioned the Lyman Black Powder handbooks. They are great for that kind of information. Easy to bring out to the range. Good luck. :thumbsup:

 

[Claude Mathis]

:snore: Old here . Are you one of those new fangled shooters that analyses things to death ?and grinds details to dust untill all the fun istaken out of a sport?

I find this post to be extremely rude. If you can't answer the man's question, please keep your sarcastic comments to yourself. He is asking us for help and doesn't deserve to be criticized.

 

[paulvallandigham]

Actually, a round lead ball will penetrate further in flesh than many conicals will, of similar weight. The BC of a round ball does not take into account the heavy weight of the ball. The larger caliber balls, ( .54- up) tend to do spectacular things on game, all out of proportion to their weight. A .58 was used to shoot Elephant in Africa, with some brutal loads, mind you, but it was done. When you get up to the .62, .69, and .74 caliber guns, they can kill very large and dangerous game as well as many of the modern magnums. Now, I am not talking about killing animals at 500 yds with a round ball. But inside 100 yds, the RB is amazingly effective. The BP conical loads are even more impressive on game.

 

[oldarmy]

Claude,
You and the members like you are why I like this forum. It is the best of the B/P forums around.
keep up the good work :thumbsup:

 

[sledgemeister]

Sent you a pm I found this site by accident and i think it has or will answer your question and calculations on coefficiency.
I would try and work it out but I think I would do my head in worrying about such things, if it goes bang and hits what I aim at generally I am happy camper. Good luck.
[url] http://www.ctmuzzleloaders.com/mlexperiments/rbballistics/rbballistics.html[/url]