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Why? Same caliber, same expansion, and one bullet has more penetration than the other. Yet you choose the bullet w/ less penetration?
(Some of my answers not being appropriate is a regular problem, my GF tells me.)
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Quoted: Per OP, if two bullets expand the same, and one falls into the 12-18" range and the other more than 18", I would chose the 12-18" one.
Why? Same caliber, same expansion, and one bullet has more penetration than the other. Yet you choose the bullet w/ less penetration?
(Some of my answers not being appropriate is a regular problem, my GF tells me.)
Quoted:
...If anything, I would say the one that overpenetrates may be a bad bullet design as it should invest the energy into expanding further....Per OP, if two bullets expand the same, and one falls into the 12-18" range and the other more than 18", I would chose the 12-18" one.
I don't think you gain anything past 18".
If anything the 18+" is probably overpowered, would have more recoil etc.
It could also mean that the 18+" bullet is just taking a lot longer to expand (if energy is the same). If a bullet penetrates 2" and then expands to 0.75" and pushes that 0.75" object 12", I think that would be better than one that makes a 9mm hole for 13" and then gradually expands to 0.75 (when it may have already exited the body).
Those are about the only 2 reasons I can think of that you would have same expansion with different penetration.
I'm not overly concerned with collateral damage with overpenetration (in a real world shoot out I think most of the shots miss, even for us internet commandos) but it is something to consider.
FINALLY: The FBI has a
LOT more experience with shoot outs than I do, and has done a
LOT of research. If they recommend 18" as a max (and 12" as a min) I would be foolish to think that I know better.