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 December 15, 2018, 08:46 AM #1 GeauxTide Senior Member   Join Date: April 20, 2009 Location: Helena, AL Posts: 3,958 Interesting Article, Unclenik In the Jan 2019 Rifle issue, they included a copy of the first Rifle issue in 1969. I found an article by Alberto de Castro that made some sense to me. He proposed a simplified alternative to the Kinetic Energy formula (KE=1/2mv(squared), using Potence=Weight times Velocity. Using a 300gr 44mag load at 1100fps, we get a potence of 330,000. Using my preferred 45 Colt load of a 285gr at 1050, we get 299,250. Love to hear your thoughts.
 December 15, 2018, 09:11 AM #2 74A95 Senior Member   Join Date: November 26, 2016 Posts: 981 Same thing as power factor (momentum) used in shooting sports. https://en.wikipedia.org/wiki/Power_...hooting_sports)
 December 15, 2018, 09:15 AM #3 ligonierbill Senior Member   Join Date: May 20, 2007 Posts: 1,765 Mass x velocity = momentum. A useful measure to be sure, but no more definitive than energy. You really can't put a single number on bullet performance.
 December 15, 2018, 09:39 AM #4 mehavey Senior Member   Join Date: June 17, 2010 Location: Virginia Posts: 5,672 Momentum (MV) ~ Penetration Energy (½MV^2) ~ Destruction
December 17, 2018, 03:17 PM   #5
Nick_C_S
Senior Member

Join Date: March 21, 2013
Location: Taxifornia
Posts: 5,052
Quote:
 Momentum (MV) ~ Penetration Energy (½MV^2) ~ Destruction
Good description^^. Of course, destruction only occurs when the bullet can dump its energy into the target. That's where hollow points come in, etc.

The Momentum or Power Factor calculation in practice favors heavy bullets. That's why most competitive pistol shooters (who have to meet Power Factor requirements) tend to use heavier bullets. From personal experience, a lighter bullet making PF will recoil more than a heavier bullet (all else being equal, blah blah blah). There are exceptions, but in general.

Kinetic energy favors velocity, since the calculation squares the velocity. This calculation favors lighter bullets because you can propel them faster (all else being equal, blah blah blah).

Of course, these two principles are the impetus (pun intended) for most all discussions about the most effective hunting or self-defense ammo.
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