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Message
re: New article from American Rifleman concerning stopping power
Posted on 9/5/12 at 1:38 pm to TexasTiger34
Posted on 9/5/12 at 1:38 pm to TexasTiger34
I have been reading the magazine since it came in 2 weeks ago. The article only looks at penetration and expansion and doesn't measure energy. Also, the 9mm includes a few +P rounds which throws off a complete comparison.
It all comes down to your preference. I would prefer the largest caliber I can easy control in the smallest package for carry and for home defense, I want a .40 or greater to backup my 12ga.
Btw, my Kahr p9 should be here today or tomorrow.
It all comes down to your preference. I would prefer the largest caliber I can easy control in the smallest package for carry and for home defense, I want a .40 or greater to backup my 12ga.
Btw, my Kahr p9 should be here today or tomorrow.
1
Posted on 9/5/12 at 4:12 pm to Helo
quote:
The article only looks at penetration and expansion and doesn't measure energy
1/2*mass*velocity*velocity
9mm:
0.5*115*1150*1150=
76,043,750 grains*(ft/s)^2
0.40:
0.5*155*1144*1144=
101,427,040 grains*(ft/s)^2
The 0.40 has about 33% more kinetic energy, but that doesn't necessarily mean more power. That just means more energy. The power will be derived by the bullets interaction with its target.
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