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Hunting >> Hunting in Africa & hunting dangerous game

Tatume
.400 member

Reged: 09/06/07
Posts: 1091
Loc: Gloucester, Va USA

Re: John Pondoro Taylor' KO effect VS SD x Velocity
04/10/08 11:01 PM

A few years ago I did an extensive analysis of all the known “stopping power” indices with representative bullet/velocity combinations for every bullet diameter available from the major American manufacturers. Thinking I had a better mousetrap, I used an index of my own design, substituting cross-sectional surface area for diameter in the Taylor KO index. I also tried substituting velocity squared for velocity, as this will give an index that accounts for energy, as opposed to the Taylor index, which effectively uses momentum multiplied by diameter.

Although I did the analysis on paper and can’t find it right now, I remember the somewhat surprising result. Except for energy, all of the other indices ranked all of the available cartridges the same, with few and minor exceptions. If a cartridge was found to have more “stopping power” than another by one index, it was ahead of the other by all indices. The only exceptions were when the cartridges were very close together, and then sometimes they would interchange, depending on which index was used. That basically meant they were a tie anyway.

Because bullet diameter is not considered, it is possible for energy to rank cartridges inappropriately. For example, a Trapdoor Springfield 45-70 load pushing a 405-gr bullet 1700 fps (more than I’m comfortable with) makes about 2600 ft-lb energy. Several 25-caliber cartridges firing 117 gr bullets will exceed that. For bison or bear, I would pick the Springfield, as I’m sure would most of you.

Energy by itself is a poor indicator of killing effectiveness. Whenever a new, hot-rod cartridge is introduced the manufacturers and gun writers exclaim the vastly increased energy over the competitors. There’s one reason for this; if you increase velocity a little you increase energy a lot. It makes better advertising to claim an additional 100 ft-lb than 50 fps.

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Subject	Posted by	Posted on
John Pondoro Taylor' KO effect VS SD x Velocity	larcher	01/10/08 08:00 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	Kalunga	01/10/08 11:50 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	peter	02/10/08 02:43 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	450_366	03/10/08 05:44 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	JPK	04/10/08 12:24 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	450_366	04/10/08 05:53 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	hoppdoc	04/10/08 08:38 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	Tatume	04/10/08 11:01 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	9.3x57	05/10/08 12:28 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	450_366	05/10/08 01:39 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	9.3x57	05/10/08 03:43 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	450_366	05/10/08 04:20 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	9.3x57	05/10/08 07:04 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	450_366	05/10/08 07:02 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	hoppdoc	06/10/08 12:04 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	Tatume	06/10/08 12:39 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	hoppdoc	06/10/08 12:48 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	hoppdoc	06/10/08 01:13 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	9.3x57	06/10/08 02:13 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	Ripp	06/10/08 09:54 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	DarylS	06/10/08 11:06 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	ALAN_MCKENZIE	06/10/08 01:28 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	JPK	06/10/08 02:09 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	shakari	06/10/08 11:17 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	DarylS	07/10/08 01:02 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	JabaliHunter	07/10/08 05:56 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	JPK	07/10/08 11:52 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	JPK	07/10/08 12:05 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	hoppdoc	07/10/08 03:59 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	9.3x57	08/10/08 01:34 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	Sarg	07/10/08 12:44 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	9.3x57	07/10/08 12:54 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	Tatume	07/10/08 02:51 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	shakari	07/10/08 01:41 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	hoppdoc	06/10/08 11:03 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	Tatume	06/10/08 03:45 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	Tatume	06/10/08 04:43 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	DarylS	06/10/08 05:16 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	hoppdoc	06/10/08 06:01 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	DarylS	05/10/08 11:22 PM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	JPK	05/10/08 09:39 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	Tatume	05/10/08 01:38 AM
Re: John Pondoro Taylor' KO effect VS SD x Velocity	9.3x57	05/10/08 03:36 AM

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