January 2, 2005

 

Barrel Weight Calculations For Both

Round And Octagon Contours

 

 

Please note you must have an MS Excel on your computer. The program is available from me by-email and it will compute the tapered and the parallel part of the barrel. You can however compute a straight section of the barrel at the receiver end in a separate computation and add the two results together. That will also apply to the barrel tenant if that little weight is important. The program has also round barrel calculations.

 

The bore diameter or the groove diameter can both be used or the average of both to compute bore volume.

 

Unfortunately I have not as yet been able to put the workable program on this web page. If you are interested and you have MS Excel on your computer I can e-mail the program to you

 

For those of you that don't have Excel here are some constants you can use to do your own calculations.

There are two radiuses you can work with R1 the outside one and R2 the inside one.

 

D1 is the diameter across the flats. D2 is the diameter across the octagon corners. The octagon is made up of eight 45 deg sections.

 

The area of the octagon can be arrived at from R1, R2, and L  L= width of flats. R = Radius. D= Diameter

 

Area= L square x 4.8284

Area = R1 square x 2.8284

Area= R2 square x 3.3137

 

L= R1 x 0.7654          R1= 1.3066 x L                 R2= 0.9239 x R1         D1= R2 x 2       Steel weighs 0.283 lbs per                                  

L= R2 x 0.8284          R1= 1.0824 x R2               R2 = 1.2071 x L          D2= R1x2          cub/inch

 

Weight of tapered barrel in lbs = Small area + big area divided by two x barrel length x weight of steel per cub/inch. Minus the bore volume which is, bore diameter divided by two = r  squared x 3.14 x barrel length x weight of steel per cub/inch 

 

 

Fred The Reloader and Wildcatter

 

 

 

 

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