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Which of these might actually be useful in predicting effectiveness?

  • Momentum

  • Kinetic Energy

  • Taylor KO Factor

  • Josserand JEDI

  • Thorniley RSPF

  • Hatcher RSP

  • Optimum Game Weight

  • None! You have to ask?

  • Punxsutawney Phil, I'd sooner trust a Groundhog.

  • My grandma, she's good with a skillet.

  • Other: Because, you know, DEI

  • Keith Pound Feet

  • Secret Formula: Good Shot Placement + Adequate Penetration = Effective

Stopping Power Poll

2.9K views 87 replies 37 participants last post by  Railsplitter  
#1 ·
I thought this might be fun. (Just for fun!)

Some folks refer to Stopping Power when talking about cartridge effectiveness so let's take a poll.

Which of the following formulas (real or empirical) do you think is a good indicator of performance?

Notice, I said indicator (real or imagined)

The first two are borrowed from physics and the rest are made up by folks who believe their formula has useful properties in being predictors, indicator, indices of performance.

Choose only one.

Below is a very brief description of each formula in case you're unfamiliar with it.

Momentum: p=mv

Kinetic Energy: KE=½mv²

Keith Pound Feet: (BW×Velocity)÷7000

Taylor KO Factor: (BW×Velocity×BD)÷7000

JEDI Josserand Energy Delivery Index: KE×FA

Thorniley RSPF: 2.866×Velocity×(BW÷7000)×√(BD)

Hatcher RSP: MAF (momentum×frontal area×form factor)


Optimum Game Weight: OGW=V³×B²×1.5×10^-12

Punxsutawney Phil: Seer of Seers, Prognosticator of Prognosticators. (Order: rodentia, Species: Marmota monax)

BW - Bullet Weight
BD - Bullet Diameter
FA - Bullet Frontal Area



Yes, I was bored. Now choose.
 
#4 ·
I don't have an answer, but interested to see the discussion. Something has to be an indicator of how much of a person a bullet can damage.
 
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#5 ·
None of the poll options. ;)
Spend enough time on gun forums and you will repeatedly see...
Location.
In a "good area" a 32 acp is deemed sufficient
Going to a "bad area" or greater threat :rolleyes: they carry 9mm or more.
Threats in "good area" deemed easier to incapacitate/stop apparently.
Threats from "bad area" are apparently immobile, one must go to them.
Location. :rolleyes:
 
#6 ·
Stopping power is kind of a misnomer in and off itself.

There is also a pretty big difference in high power rifles, intermediate cartridges, shotguns and service pistol calibers in terms of the probability of stopping a threat, or humanely killing big game.

CNS disruption, air in, blood out are factors that can be evaluated. Where projectiles hit and internal ballistics have a contribution as well.

I'll say it's complex. Different parameters need to be explored based on the limited set of possibilities.
 
#28 ·
I assumed equal shot placement went without saying.
 
#33 · (Edited)
Cant believe 18 people here still believe in KE, the Easter bunny & unicorns.🤕 I have to believe few if any of them have hunted & seen Ke fail.
 
#37 ·
Neighbor has a 1500 pound steer out and if it gets in my wife's flower beds, I'll just say "Honey come look at this!" I'll have an answer after that.
 
#38 ·
When I see the term 'kinetic energy' I can't help but think, 'the 80's called and they want their junk science back'.

Penetration and fast, accurate follow up shots would have gotten my vote if they were on the poll.
 
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#39 ·
The 'options' (explained) are perhaps one way for someone to self-gauge how long they've been around handguns deployed in a defensive role, and how well read they may be on the history involved. ;)

Having invested my fair share of years pondering this subject, and having listened to my fair share of (at least claimed) SME's on this topic, because of having carried a badge for 34-odd years and having trained as a LE firearms trainer for 26-odd years ... my default response to such a question would be "Hell if I know". ;)

From a practical perspective, since I carry retirement/LEOSA weapons, I have some interest in bullet weight weight, with a little interest in caliber (as it lends itself to the weight/mass consideration), but my primary interest and consideration is in the ability of the shooter to put accurate and effective hits ('effective' being anatomical referenced).

It's just a handgun.