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Old 10-04-2012, 01:09 AM   #11
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So doing this jug test, I assume I'd stand the standard 10ft from target when firing. Should I place something solid behind to catch in case it goes straight through, or just a second jug good enough?
What rounds are you testing? If it is a pretty penatrative round I would do lots of jugs and I have used phone books duct taped together as good back stops. Two or three large city phone book thicknesses will stop most handgun rounds.
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Old 10-04-2012, 01:14 AM   #12
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What rounds are you testing? If it is a pretty penatrative round I would do lots of jugs and I have used phone books duct taped together as good back stops. Two or three large city phone book thicknesses will stop most handgun rounds.
Exactly what I was thinking, I get 'em weekly around here. Thanks for confirm.
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Old 10-04-2012, 01:21 AM   #13
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OK I read the original post. Yeah, I'd wo with 4 milk jugs. If some of the bullet energy does not get used in expansion you may actually get more penetration. 9mm can penetrate pretty well.

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Old 10-04-2012, 06:34 AM   #14
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Here is the info on the Speer Gold Dot 9mm Air Marshals use Gold Dot 357Sig ammo on duty last time I checked.


Gold Dot Short Barrel Personal Protection - 9mm Luger +P

Part Number 23611

Cartridge------ Bullet Wt.----Bullet Type Box Count Bullet Coefficient
9mm Luger +P..... 124........... GDHP-SB.... 20...........0.134

Velocity(in feet per second)...........Energy (in foot pounds)
Muzzle....... 50 yards......100 yards..Muzzle........50 yards....100 yards
1150........... 1039..........963..........364............297..... ......255

Trajectory if sighted at 25 yards Test Barrel Length in inches 3.5 Usage
25 yards.....50 yards......75 yards......100 yards 1
0.0.........-0.9..............-3.9............-9.0



Usage Key: 1 = Personal Protection | 2 = Training | 3 = Hunting

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Old 10-04-2012, 05:15 PM   #15
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While I like the idea of +P rounds, in general, this Cobra is made of Zamak and is not rated capable of anything more than standard pressure ammunition.

That brings up another question. What makes a bullet +P vs standard? Is it the grain weight/count? My father shoots Federal Hydroshock in his 9mm and their 124gr just like the +P Speer listed above.

Edit: okay I realize it has nothing to do with the grains because there's stamdard pressure 115 & 124 in 9mm. I'm very confused on it, but as long as I read the box and make sure I getvstandard pressure rounds I'll be fine.

First I'll try those Hornady Critical Defense FTX 115gr, then my pops' Federal Hydra Shok 124gr. See if either performs better or at all and go from there.

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Old 10-04-2012, 07:33 PM   #16
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Actually, that brings up another question. Would the grains make a difference in the expansion?

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Old 10-04-2012, 08:41 PM   #17
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Quote:
Originally Posted by BeyondTheBox View Post
Actually, that brings up another question. Would the grains make a difference in the expansion?
Perhaps. A heavier bullet is generally slower. Speed gives the fluid hydraulics the ability to peel open the bullet. Less speed, less expansion pressure.

BUT, ammo makers have learned a bunch over the last 20 years. They design different hollow point shapes, sizes and volumes for different expected impact velocities. They use jacket scoring in differing numbers, depths and lengths to control the expansion.
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Old 10-04-2012, 09:36 PM   #18
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Quote:
Originally Posted by robocop10mm

Perhaps. A heavier bullet is generally slower. Speed gives the fluid hydraulics the ability to peel open the bullet. Less speed, less expansion pressure.

BUT, ammo makers have learned a bunch over the last 20 years. They design different hollow point shapes, sizes and volumes for different expected impact velocities. They use jacket scoring in differing numbers, depths and lengths to control the expansion.
That's what I was thinking. Hmmm Okay, well I'll be trying a few different types just to see what I can determine. Hopefully I'll find that at least one expands!

Though it'll be fun testing them all no matter the outcome. I've got all mu coworkers bringing their emptied jugs in!!! Hahaha yay!
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Old 10-04-2012, 11:25 PM   #19
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wear your rain gear.

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Old 10-04-2012, 11:43 PM   #20
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+P ammo information per Wikipedia.
Commercially available +P cartridges

Cartridges that are commonly boosted with +P pressures are the 9 mm Luger, .45 ACP, and .38 Special, which are all cartridges that date from the dawn of the 20th century. There has been significant improvement in metallurgy and quality since the first guns in those calibers have been made, with the result that higher pressures are now safe in modern firearms. Many models will specify to the degree they can use +P ammunition; for example, many aluminum alloy framed .38 Special revolvers should not regularly be used with +P ammunition, for while the cylinder is capable of withstanding the pressures, the added force will increase wear and reduce the service life of the gun.
SAAMI specifications for common +P cartridges are as follows:
Cartridge Standard pressure +P pressure Notes
9 mm Luger 35,000................ 38,500 10% increase
.38 Special 17,000................ 18,500 9% increase
.45 ACP 21,000................ 23,000 9.5% increase
.38 Auto 26,500................ 36,500 38% increase to make .38 Super
.45 Colt 14,000................ 27,500 96.4% increase, For use in certain modern revolvers and lever rifles
The +P+ designation is not currently used by the SAAMI, but is used by some manufacturers to designate loads that exceed the +P SAAMI specification. One source lists the 9 × 19 mm +P+ loading as having a pressure of 42,000 psi, an 18% increase over the standard pressure of 35,000 psi, and the .38 Special +P+ as 22,000, a 29% increase over the standard pressure.[5]
Small ammunition makers and reloading guides will often include special loads for specific purposes, such as the above listed .45 Colt load from Buffalo Bore Ammunition. These loads are generally designed to provide maximum performance from older cartridges, when used in newer, stronger firearms. The 14,000 psi limit for .45 Colt, for example, reflects the black powder performance of the round, and is safe even in firearms built in 1873, when the cartridge was introduced. Using modern, solid head brass in a Ruger Blackhawk revolver, a similar design originally chambered in the high pressure .44 Magnum, the pressure can be pushed far higher with no ill effects. However, since these loads, with nearly double the pressure, could destroy a firearm intended for black powder level loads, they are less commonly encountered.

38Spl +P+ Box

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