1. Placement
2. Placement
3. PLACEMENT
I don't know how much "real world" difference there is, but I recently switched from 115 gr +P JHP 9mm to 147gr JHP in my CZ RAMI. I made the switch mainly because my RAMI didn't feed light +P rounds reliably. Ever since I switched to the heavier non +P rounds, I have 400-500 rounds without a hitch. The more I think about it, I guess I do like the idea of a heavier, slower bullet for close range encounters....seems like there'd be less chance of over-penetration. I haven't seen any studies to back this up though. Anyway, just my opinion.
Now let's compare the two rounds using Winchester's penetration numbers in bare gelatin:
147gr = 13.9"
124gr+P = 12.2"
If the 124gr. +P has more momentum than the 147, why did the 147gr. penetrate deeper?
That is because the 124gr. was dependent on it's velocity for it's momentum. Once the bullet strikes it's target, the velocity is quickly lost where as the mass of the 147gr, not being as dependent on velocity for it's momentum, penetrated deeper. The higher velocity 124gr bullet almost assuredly expanded quicker than the 147gr bullet due to it's velocity further reducing it's penetration. In this example the 124gr. bullet expanded to .70 caliber where as the 147gr. expanded to .65 and retained more weight - 141gr. overall compared to 116.2 for the 124gr bullet.
Any round will do the job if it hits the right place. Many newbies mistakenly believe that the bigger the round, the more "manly" you are. However, carrying a big caliber will not amount to a hill of beans if you can't hit what you're shooting at. You should only carry what you can shoot well. To hell with anyone who makes you believe that you're a wimp if you prefer a .380 over a .357 magnum or a .32 over a .45.
Now let's compare the two rounds using Winchester's penetration numbers in bare gelatin:
147gr = 13.9"
124gr+P = 12.2"
If the 124gr. +P has more momentum than the 147, why did the 147gr. penetrate deeper?
That is because the 124gr. was dependent on it's velocity for it's momentum. Once the bullet strikes it's target, the velocity is quickly lost where as the mass of the 147gr, not being as dependent on velocity for it's momentum, penetrated deeper. The higher velocity 124gr bullet almost assuredly expanded quicker than the 147gr bullet due to it's velocity further reducing it's penetration. In this example the 124gr. bullet expanded to .70 caliber where as the 147gr. expanded to .65 and retained more weight - 141gr. overall compared to 116.2 for the 124gr bullet.
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