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Old 04-08-2012, 18:46   #1
03Cobra
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First time with 20sf

Today was my first time to shoot my 20sf and I was really impressed. The gun is very accurate; I shoot it better than any of my other pistols (including my other glocks). I had one FTE out of 150 rounds which I was disappointed in; but my friend was shooting at the time so I just blamed his weak wrist. Hopefully it will not happen again.

We set up 4 2x6s tied together in front of a cement block an compared FMJ ammo from the 10mm, 40cal, 45acp, and 357. The 40 and 45 only made it through two boards, but the 10mm and 357 both made it all the way through to the cement block.

The 357 was definitely more powerful though because it left a big crater in the block while the 10mm just stopped after the wood.

This is my new favorite pistol, I absolutely love the gun; I can hit anything I want with it.

The 10 Ring

Those are the three bullets pulled from the cement block .
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Old 04-08-2012, 19:13   #2
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Quote:
Originally Posted by 03Cobra View Post

The 357 was definitely more powerful though because it left a big crater in the block while the 10mm just stopped after the wood.

This is my new favorite pistol, I absolutely love the gun; I can hit anything I want with it.

The 10 Ring

Those are the three bullets pulled from the cement block .
Im glad you liked it! But, remember this about the 10mm, it is bigger, this it had to displace more wood than the .357 did to go the same distance...Going strictly by the numbers, all things being equal, the 10mm will propel a bullet faster than the 357...
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Old 04-08-2012, 19:44   #3
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I guess you have a point there. I'm going hiking in black bear country in two weeks; I don't plan on needing a gun but will take either the 20sf or the 6 shot 357. I assume by your post the 20sf would be the preferred choice?
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Old 04-08-2012, 20:05   #4
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Well 16 shots of most anything beats 6 in my book...but get yourself some 200gr xtp's from underwoodammo and you'll be set!

Also, what kind of ammo did you use for your test?
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Old 04-08-2012, 20:16   #5
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My G20SF is my favorite Glock also! Welcome to the 10 ring!
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Old 04-08-2012, 20:19   #6
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Well 16 shots of most anything beats 6 in my book...but get yourself some 200gr xtp's from underwoodammo and you'll be set!

Also, what kind of ammo did you use for your test?
I used the 180gr underwood ammo FMJ, bought on your advice. It is great stuff at a great price. 200gr xtp shoot good from the factory barrel?
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Old 04-08-2012, 20:45   #7
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Congrats on the G20.
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Old 04-08-2012, 20:46   #8
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The 357 was definitely more powerful though because it left a big crater in the block while the 10mm just stopped after the wood.
Depends on the ammo. 357mag and 10mm have virtually identical energy output capabilities.
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Old 04-08-2012, 22:39   #9
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I had the exact same reaction with my G20SF, it is my favorite handgun.

I am going to buy a few more because I am certain as much as I like this gun, Glock will be discountinuing it soon.
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Old 04-09-2012, 11:56   #10
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I used the 180gr underwood ammo FMJ, bought on your advice. It is great stuff at a great price. 200gr xtp shoot good from the factory barrel?
Yes, the factory barrel can handle any ammo you buy for it, and all but the most nuclear handloads. So no worries.
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Old 04-09-2012, 12:12   #11
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Thanks, I was a little worried about the accuracy with the heavier bullet. I watched a video of a 10mm on YouTube that was shooting the 220gr bullets (hick45 or something like that) and the factory barrel was not accurate at all compared to the aftermarket barrel. The bullets just didn't fly right out of the factory barrel.
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Old 04-09-2012, 12:15   #12
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By the way, I also shot a couple of 40cal bullets out of my 20. I didn't have any issues, but was wondering if there are any concerns with this.
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Old 04-09-2012, 12:20   #13
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Better get a conversion barrel if you want to shoot .40's. I recommend LWD.
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Old 04-09-2012, 12:47   #14
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.40cal rounds run through 10mm barrel just fine, some people say not to do it, some say its perfectly ok. Fact is, everyone that does this has never had an issue arise from it. I think if youre going to shoot more .40sw than 10mm you should go ahead and get the conversion barrel...

Bullet weights over 200gr arent stabilized by the stock 10mm barrel, so bullets heavier than that do require an aftermarket barrel to shoot properly, usually.
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Old 04-09-2012, 13:27   #15
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Hickok45 was shooting 220gr hardcast bullets in that video. If that were jacketed bullets no issue would occur w. factory barrel. Just get Underwood's 200gr XTP's and you're good to go hiking.
Glock barrel's polygonal rifling has some problem stabilizing faster hardcast bullets but no problem w. jacketed
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Old 04-09-2012, 14:30   #16
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.40cal rounds run through 10mm barrel just fine, some people say not to do it, some say its perfectly ok. Fact is, everyone that does this has never had an issue arise from it. I think if youre going to shoot more .40sw than 10mm you should go ahead and get the conversion barrel...

Bullet weights over 200gr arent stabilized by the stock 10mm barrel, so bullets heavier than that do require an aftermarket barrel to shoot properly, usually.
So basically, the 40S&W headspaces on the extractor?

I wonder if anything happens to pressure if you are shooting something like a SWC and the shelf of the wadcutter hangs up on the end of the chamber? In my imagination I could see a wedged bullet and a kaboom, but have never heard of this happening.

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Old 04-09-2012, 17:54   #17
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I'm not going to regularly shoot .40 out of the 20, that isn't why I bought the 10mm; but it is nice to know I could if the situation required it (emergency). Thanks for the feedback everyone; very helpful.
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