Need a formula

[Jim]

I usta know the formula for determining the weight of a round ball of pure lead based on the diameter. Can of of y'all post it for me?
Seems the older I get, the more ustas and shouldas I have.

[mooman76]

I don't have a formula but if you have a Dixiegunworks catalog they have a chart in the back that has the weights of RB's per caliber from .200 - .920. I like having a Dixie catalog around just for the little tid bits of odd info they have in the back. Looking for a particular size?

[Underclocked]

http://www.beartoothbullets.com/rescources/calculators/php/roundball.htm


or


Volume of sphere = 4/3 • pi • r³

use 3.14 for pi

use 1/2 the bullet diameter for radius (r) in units of inches



a 1" diameter ball of pure lead would have a volume of 4/3 • 3.14 • 1/2 ³ = 1.333 • 3.14 • .125 in³ = 0.523333... cu in.

~2878 grains per cu in of pure lead so 2878 grain/cu in • 0.52333 cu in = 1506 grains = weight of a 1" round ball in pure lead.


at leest dat'z how ah seez it.

[northmn]

Thats how it is calculated. Impurites and inclusions will give you different answers than published data for various ball weights. I have a spreadsheet using the same formula. It gives very close results. Also a .445 ball may come out from one mold as .4443 and another as .4455, so there is that also.

Northmn