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FMJ -vs- JHP
#1
It was always my thought JHP was people ammo and FMJ was target. Just lately , buying a G-17 9mm.
I was thinking of staggering the 17 round mags for home use. One JHP followed oneFMJ etc.. I've heard so much about the 9mm. I think that might be a for sure way to go with a 9mm. One penetration the other impact energy ?

What say you all ?
dman, proud to be a member of pa2a.org since Sep 2012.
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#2
(09-09-2012, 07:07 PM)dman Wrote: It was always my thought JHP was people ammo and FMJ was target. Just lately , buying a G-17 9mm.
I was thinking of staggering the 17 round mags for home use. One JHP followed oneFMJ etc.. I've heard so much about the 9mm. I think that might be a for sure way to go with a 9mm. One penetration the other impact energy ?

What say you all ?
won't hurt the gun, but I'd worry about possible over penetration.
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#3
I've recently moved from FMJ to JHP. Why? In the unlikely event of needing to release a round at an assailant, the possibility of frags or richochets...or over-penetration of FMJ is too great. Battlefield, FMJ. Self-defense? JHP.
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#4
With good enough JHP, penetration won't be an issue. I would suggest the gold dot 147 grain if you want deep penetration. I've seen tests with ballistics gel and 4 layers of denim where it goes 15+ inches. Although it didn't create as big of a wound cavity as a lighter 9mm JHP would, it is still better than running FMJ as your defensive round.

Remember, a general rule of thumb with JHP, heavier bullets penetrate more but expand less while lighter bullets expand more and penetrate less. Also if you take two bullets of the same weight and fire one with normal pressure and one with +p, the normal pressure will penetrate farther but not expand as well and the +p will expand better but penetrate less. This is just a general rule of thumb and to get a better feel for the rounds you chose you should do you own tests.
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#5
I've been spending a lot of time away from home and it's for the wife. She hates my .45 but will shoot and shoot well with the 9mm. If you saw where I live , over penetration is not a bother unless it's my big screen
TV . I've got some time away from home coming up and just figured I'd get some feed-back.Thanks

(09-09-2012, 07:24 PM)Shisno Wrote: With good enough JHP, penetration won't be an issue. I would suggest the gold dot 147 grain if you want deep penetration. I've seen tests with ballistics gel and 4 layers of denim where it goes 15+ inches. Although it didn't create as big of a wound cavity as a lighter 9mm JHP would, it is still better than running FMJ as your defensive round.

Remember, a general rule of thumb with JHP, heavier bullets penetrate more but expand less while lighter bullets expand more and penetrate less. Also if you take two bullets of the same weight and fire one with normal pressure and one with +p, the normal pressure will penetrate farther but not expand as well and the +p will expand better but penetrate less. This is just a general rule of thumb and to get a better feel for the rounds you chose you should do you own tests.
If it were me I'd +p 230 .JHP .45 but it's the wife. She's comfortable with 115 - 9mm.
dman, proud to be a member of pa2a.org since Sep 2012.
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#6
Not the first time I've read of somebody taking this approach. All I know is people in the military that I talk to blame FMJ rounds for a whole lotta failure to stop.
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#7
(09-09-2012, 07:26 PM)dman Wrote: I've been spending a lot of time away from home and it's for the wife. She hates my .45 but will shoot and shoot well with the 9mm. If you saw where I live , over penetration is not a bother unless it's my big screen
TV . I've got some time away from home coming up and just figured I'd get some feed-back.Thanks

(09-09-2012, 07:24 PM)Shisno Wrote: With good enough JHP, penetration won't be an issue. I would suggest the gold dot 147 grain if you want deep penetration. I've seen tests with ballistics gel and 4 layers of denim where it goes 15+ inches. Although it didn't create as big of a wound cavity as a lighter 9mm JHP would, it is still better than running FMJ as your defensive round.

Remember, a general rule of thumb with JHP, heavier bullets penetrate more but expand less while lighter bullets expand more and penetrate less. Also if you take two bullets of the same weight and fire one with normal pressure and one with +p, the normal pressure will penetrate farther but not expand as well and the +p will expand better but penetrate less. This is just a general rule of thumb and to get a better feel for the rounds you chose you should do you own tests.
If it were me I'd +p 230 .JHP .45 but it's the wife. She's comfortable with 115 - 9mm.

Also I forgot, another good rule of thumb is the heavier bullet will recoil less. That may be good for your wife. Maybe try out a few different loads and see which shoots the best.
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#8
I would just load up with some 147gr Gold Dots or HST. Assuring that they're 147gr will give you a more consistent penetration depth. The 115gr +P DPX is the only lightweight rounds I'd use. I wouldn't bother staggering the magazine.
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#9
(09-09-2012, 07:07 PM)dman Wrote: It was always my thought JHP was people ammo and FMJ was target. Just lately , buying a G-17 9mm.
I was thinking of staggering the 17 round mags for home use. One JHP followed oneFMJ etc.. I've heard so much about the 9mm. I think that might be a for sure way to go with a 9mm. One penetration the other impact energy ?

What say you all ?

I think that you don't need to use FMJ for most defensive situations.

It would be wiser to keep a back up mag loaded with really deep penetrating rounds, but even then i wouldnt use FMJs, i'd use hard cast flat nose lead rounds, preferably in +P.

Such rounds will dramatically out perform FMJ in penetration, and it will also create a superior wound tract.

Round nosed FMJ should be used only for range duty.

BTW, Shisno's observations go right out the window with solid copper bullets. The faster you drive them, the deeper they go.

(09-09-2012, 10:42 PM)Shisno Wrote: Also I forgot, another good rule of thumb is the heavier bullet will recoil less. That may be good for your wife. Maybe try out a few different loads and see which shoots the best.
Heavier bullets recoil MORE, not less.

(09-09-2012, 10:42 PM)Shisno Wrote: Also I forgot, another good rule of thumb is the heavier bullet will recoil less. That may be good for your wife. Maybe try out a few different loads and see which shoots the best.
Heavier bullets recoil MORE, not less.

BTW:

Heavier bullets recoil MORE, not less.
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#10
I would be concerned about over penetration with FMJ 9mms.  Also, in a home defense situation, the odds of you needing to shoot something that would stop a JHP and not a FMJ is pretty slim.  Given the risk/benefit balance, I would stay with JHPs.
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