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Old 07-23-2014, 12:24   #1
762x51n8o
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G31, G32, G33 penetration

I just got a Clear Ballistics FBI block, so I'm new to bullet penetration.

Is there going to be significant difference between the penetration of the 3 barrel lengths of the 3 .357 Sig Glocks, because I didn't get any. The 31 had 11 3/4" penetration, the 32 had 11", and the 33 had 11 3/8". Using Sig Sauer Elite 125 gr ammo.

Would this be typical,and just the fluctuation between cartridge manufacturing, or should the depth correspond with the length of barrel. I have always read that longer barrels produce higher velocities, which I would think would correlate to deeper penetration with such a fast moving bullet
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Old 07-23-2014, 12:50   #2
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They worked as they should, you are only talking about 30-40 FPS between the different pistols depending on ammunition.
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Old 07-23-2014, 12:55   #3
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Usually, the higher velocity ammo will penetrate less, at least with JHPs. So your results are confusing. The minimal differences are attributable to slight variations in the bullets expanding.
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Old 07-23-2014, 13:02   #4
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Originally Posted by JBP55 View Post
They worked as they should, you are only talking about 30-40 FPS between the different pistols depending on ammunition.

OK, so I got good results then. Most ammo manufacturers get differences of around 40 fps just between rounds, right?

Expansion on these bad boys was beautiful, very uniform.

L to R: 31, 32, 33

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Old 07-23-2014, 13:04   #5
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There's tons of good ammo these days. What made you buy the Sig ammo instead of a more proven round?
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Old 07-23-2014, 13:11   #6
762x51n8o
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There's tons of good ammo these days. What made you buy the Sig ammo instead of a more proven round?

I have 2 weeks to test the gun, and that's all that's on store shelves.
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Old 07-23-2014, 13:13   #7
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I admit complete ignorance on the .357 Sig. Next up will be the .45 GAP, Which I know even less about. Hopefully will get some federal ammo for that. After that I'll be testing stuff I'm far more familiar with.
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Old 07-23-2014, 21:32   #8
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To bad that the Sig ammo was all you had. If you are looking for penetration in this caliber go with Gold Dot or Golden Saber, they are the ..GOLD.. standards for penetration in the 357 Sig!
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Old 07-23-2014, 21:38   #9
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Quote:
Originally Posted by JBP55 View Post
...you are only talking about 30-40 FPS between the different pistols depending on ammunition.
Using heavy-load Underwood 125 gr. JHP, I get these results for average ballistics 15 feet in front of muzzle:

G31 (4.5-inch Glock OEM barrel) - 1565 fps (680 ft-lbf)
G33 (3.4-inch Glock OEM barrel) - 1410 fps (552 ft-lbf)

That shows a significant (but expected) 155 fps velocity loss due to the 1.1-inch shorter G33 barrel.
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Old 07-23-2014, 21:57   #10
762x51n8o
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Originally Posted by Mike-M View Post
Using heavy-load Underwood 125 gr. JHP, I get these results for average ballistics 15 feet in front of muzzle:



G31 (4.5-inch Glock OEM barrel) - 1565 fps (680 ft-lbf)

G33 (3.4-inch Glock OEM barrel) - 1410 fps (552 ft-lbf)



That shows a significant (but expected) 155 fps velocity loss due to the 1.1-inch shorter G33 barrel.

How does velocity loss translate into penetration loss?

Using the mentioned Sig Sauer ammo, with the chronology 5 feet in front of muzzle, the sig ammo averaged:
G31: 1316.4 fps
G32: 1277.6 fps (38.8 fps slower than G31)
G33: 1230.6 fps (47 fps slower than G32)

Pretty weak compared to what you got. I know underwood has a reputation for getting max performance out of their loads.
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Old 07-23-2014, 22:01   #11
762x51n8o
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Originally Posted by Railsplitter View Post
To bad that the Sig ammo was all you had. If you are looking for penetration in this caliber go with Gold Dot or Golden Saber, they are the ..GOLD.. standards for penetration in the 357 Sig!

Now that I think about it, there was some Hornady there too. I grabbed the sig because I thought since it's their cartridge they would make the best load. Like putting your best foot forward. Guess that's not the case. Now that I compare the velocities with other ammo, it just looks like another Lawyer Load.
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Old 07-24-2014, 08:56   #12
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Quote:
Originally Posted by 762x51n8o View Post
How does velocity loss translate into penetration loss?

Using the mentioned Sig Sauer ammo, with the chronology 5 feet in front of muzzle, the sig ammo averaged:
G31: 1316.4 fps
G32: 1277.6 fps (38.8 fps slower than G31)
G33: 1230.6 fps (47 fps slower than G32)

Pretty weak compared to what you got. I know underwood has a reputation for getting max performance out of their loads.
Typically what happens as vel goes up, bullets expand to a greater dia & that slows penetration. It is not uncommon to see bullets from a shorter bbl to penetrate a little bit more. At really high vel, bullets can fragment & really reduce penetration.
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Last edited by fredj338; 07-24-2014 at 11:23..
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Old 07-24-2014, 09:40   #13
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Quote:
Originally Posted by 762x51n8o View Post
OK, so I got good results then. Most ammo manufacturers get differences of around 40 fps just between rounds, right?

Expansion on these bad boys was beautiful, very uniform.

L to R: 31, 32, 33

Caliber CornerCaliber Corner

They always do in jello. Bullets pulled from real BG's do not always look so nice.
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Old 07-24-2014, 09:55   #14
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How does velocity loss translate into penetration loss?...
Ever jumped out of an airplane with a parachute? Think about it.
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