ASSRA Forum - diameter/weight/length formula?

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diameter/weight/length formula? (Read 6691 times)

SSShooter Frequent Elocutionist Offline Posts: 2917 Location: Southern NJ Joined: Aug 1^st, 2010	Re: diameter/weight/length formula? Reply #15 - Dec 19^th, 2013 at 8:21pm	Print Post
	gunlaker wrote on Dec 19^th, 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 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 Frequent Elocutionist Online Posts: 7268 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: diameter/weight/length formula? Reply #16 - Dec 19^th, 2013 at 8:43pm	Print Post
	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

	ASSRA Member #696, ISSA Member #339
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joeb33050 Frequent Elocutionist Offline Posts: 2613 Location: Marathon, FL Joined: Apr 20^th, 2004	Re: diameter/weight/length formula? Reply #17 - Dec 21^st, 2013 at 4:54am	Print Post
	frnkeore wrote on Dec 19^th, 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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BP Frequent Elocutionist Offline Posts: 8039 Location: Westside Joined: Aug 27^th, 2006	Re: diameter/weight/length formula? Reply #18 - Dec 21^st, 2013 at 5:40am	Print Post
	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.

	There are three kinds of men: The ones that learn by reading, the few who learn by observation, and the rest who have to pee on the electric fence and find out for themselves. Proud Noodlehead
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SSShooter Frequent Elocutionist Offline Posts: 2917 Location: Southern NJ Joined: Aug 1^st, 2010	Re: diameter/weight/length formula? Reply #19 - Dec 21^st, 2013 at 6:37am	Print Post
	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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