Glock Talk

Glock Talk (http://glocktalk.com/forums/index.php)
-   Caliber Corner (http://glocktalk.com/forums/forumdisplay.php?f=31)
-   -   Do FMJHP's expand? (http://glocktalk.com/forums/showthread.php?t=1453139)

Sgt.K 11-14-2012 13:46

Do FMJHP's expand?
 
Just wondering if .223/5.56 full metal jacket hollow points in either 55 or 62 grain actually expand as, I imagine, a semi jacketed would?

SCmasterblaster 11-14-2012 14:08

The .223 HPs
 
have a sizable cavity. And at the high speeds they operate, bullet expansion is very likely. :cool:

cowboy1964 11-14-2012 15:52

Rifle JHPs don't expand like pistol rounds do, they fragment. All the hollow point does is (supposedly?) aid accuracy and tendency to yaw (which causes fragmentation).

Jacketed Soft Points (JSPs) expand though. I don't hear them referred to as "semi-jacketed" much.

fredj338 11-14-2012 18:40

FMJHP is kind of an oximoron. The open tipped match type bullet can expand but can also pencil thru or fragment. Why they are not the best choice to hunt with in most calibers. A true JHP rifle bullet can certainly expand properly if designed to do so.

SCmasterblaster 11-14-2012 19:55

Well
 
Quote:

Originally Posted by cowboy1964 (Post 19631382)
Rifle JHPs don't expand like pistol rounds do, they fragment. All the hollow point does is (supposedly?) aid accuracy and tendency to yaw (which causes fragmentation).

Jacketed Soft Points (JSPs) expand though. I don't hear them referred to as "semi-jacketed" much.

how very interesting . . . . .

CanyonMan 11-14-2012 22:33

Quote:

Originally Posted by fredj338 (Post 19632006)
FMJHP is kind of an oximoron. The open tipped match type bullet can expand but can also pencil thru or fragment. Why they are not the best choice to hunt with in most calibers. A true JHP rifle bullet can certainly expand properly if designed to do so.


Hey my friend ! Hope all is well !

Your post here ?...... :thumbsup:



Stat safe amigo !






CanyonMan

SCmasterblaster 11-15-2012 16:11

Question
 
Do ammo makers offer .308Win with hollow point bullets?

RWBlue 11-15-2012 22:53

Quote:

Originally Posted by SCmasterblaster (Post 19635313)
Do ammo makers offer .308Win with hollow point bullets?

Yes
Federal match ammo comes to mind.

SCmasterblaster 11-16-2012 13:56

Quote:

Originally Posted by RWBlue (Post 19636671)
Yes
Federal match ammo comes to mind.

Thanx!

Glock19Fan 11-16-2012 17:27

The .308 bullet (7.62x51) is one of the few calibers the military openly issued hollow points to.

Zombie Steve 11-16-2012 19:09

The thin drawn jacket on most open tip match (hollow point bullets) lends itself to fragmentation. While I think they work better on soft targets than fmj, they are designed for flight and flight alone. They just have to punch a hole in paper or make steel ring. The hollow cavity in the tip is to move the center of gravity back on the bullet and help stabilization in flight. If you want expansion, get a hunting bullet. Soft point, partition / A-frame, or something bonded like the accubond or deep curl.

Glock19Fan 11-16-2012 19:35

Quote:

Originally Posted by Zombie Steve (Post 19639387)
The thin drawn jacket on most open tip match (hollow point bullets) lends itself to fragmentation. While I think they work better on soft targets than fmj, they are designed for flight and flight alone. They just have to punch a hole in paper or make steel ring. The hollow cavity in the tip is to move the center of gravity back on the bullet and help stabilization in flight. If you want expansion, get a hunting bullet. Soft point, partition / A-frame, or something bonded like the accubond or deep curl.

This is true. The bullet yaws and fragments much like the M193 style bullets of the 5.56mm (which is actually true for any pointed bullet with somewhat fragile construction).

They are much more effective than FMJ bullets against unarmored targets.

SCmasterblaster 11-16-2012 20:42

Quote:

Originally Posted by Glock19Fan (Post 19639466)
This is true. The bullet yaws and fragments much like the M193 style bullets of the 5.56mm (which is actually true for any pointed bullet with somewhat fragile construction).

They are much more effective than FMJ bullets against unarmored targets.

I agree, brother! Good description.

WiskyT 11-17-2012 18:50

Quote:

Originally Posted by Zombie Steve (Post 19639387)
The thin drawn jacket on most open tip match (hollow point bullets) lends itself to fragmentation. While I think they work better on soft targets than fmj, they are designed for flight and flight alone. They just have to punch a hole in paper or make steel ring. The hollow cavity in the tip is to move the center of gravity back on the bullet and help stabilization in flight. If you want expansion, get a hunting bullet. Soft point, partition / A-frame, or something bonded like the accubond or deep curl.


According to my old Hornady manual, the BTHP match bullets, Hornady's anyway. are made that way for two reasons. The HP makes the bullet longer for a given weight which increases the bearing surface. Also, the HP allows the base to be closed which means it's more uniform. A uniform base is critical to accuracy.

As for expansion, the match type bullets, according to Hornady, are not to be used for game as there performance can't be predicted. The Sierra BTHP match bullets apparently are destructive and are used by the military for this purpose with a nod and a wink in addition to their accuracy.

There are HP varmint bullets. They are designed to basically disintegrate on impact to minimize downrange hazards. Some of them are so fragile that they will fly apart in flight if they are shot too fast through a too high rate of twist barrel.

WiskyT 11-17-2012 18:53

Also, there are/were some combloc steel jacketed HP rounds sold cheap at one time. They looked like they would be good expanders, but apparently some of them acted just like ball ammo.

Overall, you need to see what a specific bullet was designed for. The bullet/ammo companies make the bullets/ammo for specific purposes.

SCmasterblaster 11-18-2012 07:26

Quote:

Originally Posted by WiskyT (Post 19642287)
According to my old Hornady manual, the BTHP match bullets, Hornady's anyway. are made that way for two reasons. The HP makes the bullet longer for a given weight which increases the bearing surface. Also, the HP allows the base to be closed which means it's more uniform. A uniform base is critical to accuracy.

As for expansion, the match type bullets, according to Hornady, are not to be used for game as there performance can't be predicted. The Sierra BTHP match bullets apparently are destructive and are used by the military for this purpose with a nod and a wink in addition to their accuracy.

There are HP varmint bullets. They are designed to basically disintegrate on impact to minimize downrange hazards. Some of them are so fragile that they will fly apart in flight if they are shot too fast through a too high rate of twist barrel.

I had forgotten all about that - the fact that HP or SP bullet have enclosed bases.


All times are GMT -6. The time now is 06:31.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2013, Glock Talk, All Rights Reserved.