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SSShooter
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Re: diameter/weight/length formula?
Reply #15 - Dec 19th, 2013 at 8:21pm
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gunlaker wrote on Dec 19th, 2013 at 7:03pm:
For reference, I just weighed a Buffalo Arms 324gr "money bullet" in 20:1 alloy.  It is 1.322" long and the formula predicts 1.251".  Still probably good enough for whatever you want it for Smiley
Chris.

Indeed it is. Find it to be a very accurate bullet at both 200/300yd & meters when pushed by 56gr of 2F Swiss or 58gr of 2F Goex in my rifle. The 108 of them that I cast this a.m. weighed 326+/- 0.4gr using BACo's 20-1 lead.
  
Glenn - 2x CPA 44 1/2 w/22LR (Shilen ratchet-rifled & Bartlein 5R rifled), 38-40RH & 38-55WCF (Bartlein 5R rifled) & 40-65WCF (GrnMtn 'X') barrels
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frnkeore
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Re: diameter/weight/length formula?
Reply #16 - Dec 19th, 2013 at 8:43pm
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Quote:
Frank;
Would you tell us about sample weights of the two bullets?


I weighed 15 of each, the 320366 weighed 186.6 - 186.8. The Paul Jones weighed 203.8 - 204.0. The reason the PJ is lighter than the drawing is because it is a tapered bullet and the drawing is cylinderical. The actual mixure that the weighed bullets were cast of is 22/1.

Doubting the results of this program is like doubting the results obtained in a Excel program. It is a CAD program that measures the internal volume of the bullet mold.

Frank
  
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joeb33050
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Re: diameter/weight/length formula?
Reply #17 - Dec 21st, 2013 at 4:54am
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frnkeore wrote on Dec 19th, 2013 at 8:43pm:
Quote:
Frank;
Would you tell us about sample weights of the two bullets?


I weighed 15 of each, the 320366 weighed 186.6 - 186.8. The Paul Jones weighed 203.8 - 204.0. The reason the PJ is lighter than the drawing is because it is a tapered bullet and the drawing is cylinderical. The actual mixure that the weighed bullets were cast of is 22/1.

Doubting the results of this program is like doubting the results obtained in a Excel program. It is a CAD program that measures the internal volume of the bullet mold.

Frank

I doubt just about everything.
About this, I'm now just surprised. It takes a lot of grease grooves and/or a long pointed nose to get that length weight ratio.
  
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Re: diameter/weight/length formula?
Reply #18 - Dec 21st, 2013 at 5:40am
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Cat_Whisperer wrote Quote:
Just a few keystrokes when drawn in 3d cad!

A mass properties inquiry of a 3d solid drawn in cad is fast.

  
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SSShooter
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Re: diameter/weight/length formula?
Reply #19 - Dec 21st, 2013 at 6:37am
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Indeed. We build submarines, tall buildings, supersonic (and not) airplanes, bridges, etc. with the math imbedded in CAD programs. A bullet is 'child's play' in comparison.
  
Glenn - 2x CPA 44 1/2 w/22LR (Shilen ratchet-rifled & Bartlein 5R rifled), 38-40RH & 38-55WCF (Bartlein 5R rifled) & 40-65WCF (GrnMtn 'X') barrels
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