Comments on: .22 Mag vs. 5.7x28mm http://gunnuts.net/2009/11/23/22-mag-vs-5-7x28mm/ Gun info by shooters, for shooters Thu, 24 May 2012 16:23:55 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: Joe Huffman http://gunnuts.net/2009/11/23/22-mag-vs-5-7x28mm/#comment-14401 Joe Huffman Wed, 25 Nov 2009 03:40:34 +0000 http://gunnuts.net/?p=4792#comment-14401 Caleb, At 50 yards the 5.7 is going to lose something on the order of 140 fps. The .22 Magnum is going to lose about 165 fps. And that is for 50 yards--far more than most pistol shootings take place at. In terms of terminal performance the velocity is probably not going to be the determining factor. Almost for certain it's going to be bullet design. If the 5.7 is an armor pierce bullet but doesn't encounter any armor (as was almost for certain the case in the Ft hood casualties) then my bet (and I don't bet unless I'm pretty certain I'm going to win) is that .22 Mag is going to have better terminal performance. Since it is unlikely the ammo used at Ft. Hood was AP we can't really say with a great deal of certainty which cartridge would have been "more deadly" until we know the type of bullet actually used. Caleb,

At 50 yards the 5.7 is going to lose something on the order of 140 fps. The .22 Magnum is going to lose about 165 fps. And that is for 50 yards–far more than most pistol shootings take place at.

In terms of terminal performance the velocity is probably not going to be the determining factor. Almost for certain it’s going to be bullet design.

If the 5.7 is an armor pierce bullet but doesn’t encounter any armor (as was almost for certain the case in the Ft hood casualties) then my bet (and I don’t bet unless I’m pretty certain I’m going to win) is that .22 Mag is going to have better terminal performance.

Since it is unlikely the ammo used at Ft. Hood was AP we can’t really say with a great deal of certainty which cartridge would have been “more deadly” until we know the type of bullet actually used.

]]> By: Caleb http://gunnuts.net/2009/11/23/22-mag-vs-5-7x28mm/#comment-14364 Caleb Tue, 24 Nov 2009 13:26:47 +0000 http://gunnuts.net/?p=4792#comment-14364 Michael - the reason is that the slow burning rifle powder in the .22 Magnum case tends to well, not burn and then deposit crud everywhere. Michael – the reason is that the slow burning rifle powder in the .22 Magnum case tends to well, not burn and then deposit crud everywhere.

]]> By: Weer'd Beard http://gunnuts.net/2009/11/23/22-mag-vs-5-7x28mm/#comment-14361 Weer'd Beard Tue, 24 Nov 2009 13:04:24 +0000 http://gunnuts.net/?p=4792#comment-14361 FYI, a buddy of mine who has a P90 attempted to handload for it. He found that after a few loadings he was having severe FTE issues. Seems that 5.7x28mm is more-or-less a straight-sided case with almost no taper, and there is some sort of low-friction coating on the cases to allow extraction. After a few loadings, and tumblings , this coating is rubbed off and the cases stick. So both 5.7x28, and .22 WMR can both be essentially considered non-re-loadable. FYI, a buddy of mine who has a P90 attempted to handload for it. He found that after a few loadings he was having severe FTE issues.

Seems that 5.7x28mm is more-or-less a straight-sided case with almost no taper, and there is some sort of low-friction coating on the cases to allow extraction. After a few loadings, and tumblings , this coating is rubbed off and the cases stick.

So both 5.7×28, and .22 WMR can both be essentially considered non-re-loadable.

]]> By: Michael in CT http://gunnuts.net/2009/11/23/22-mag-vs-5-7x28mm/#comment-14359 Michael in CT Tue, 24 Nov 2009 03:31:48 +0000 http://gunnuts.net/?p=4792#comment-14359 I went to the Brass Fetcher website and presuming I interpreted everything correctly, I am underwhelmed by the 5.7 compared to the 22 Mag, using the same weight bullet, the 5.7 gained about 150 fps, although the 40gr 5.7 load had a significant standard deviation for the 3 shots in the test. On an under related note, why is it that .22 Magnum revolvers, regardless of manufacture, seems to need the cylinders brushed out within 20 rounds? I went to the Brass Fetcher website and presuming I interpreted everything correctly, I am underwhelmed by the 5.7 compared to the 22 Mag, using the same weight bullet, the 5.7 gained about 150 fps, although the 40gr 5.7 load had a significant standard deviation for the 3 shots in the test.

On an under related note, why is it that .22 Magnum revolvers, regardless of manufacture, seems to need the cylinders brushed out within 20 rounds?

]]> By: Caleb http://gunnuts.net/2009/11/23/22-mag-vs-5-7x28mm/#comment-14358 Caleb Tue, 24 Nov 2009 01:28:56 +0000 http://gunnuts.net/?p=4792#comment-14358 Frank, I’d like to try it. It might be a fun “winter time project” when I’m not busy destroying a Ruger LCR. Joe, I was thinking that the 5.7 bullet would retain velocity better over longer ranges because it's more aerodynamic. Frank, I’d like to try it. It might be a fun “winter time project” when I’m not busy destroying a Ruger LCR.

Joe, I was thinking that the 5.7 bullet would retain velocity better over longer ranges because it’s more aerodynamic.

]]> By: Dwight http://gunnuts.net/2009/11/23/22-mag-vs-5-7x28mm/#comment-14356 Dwight Tue, 24 Nov 2009 00:48:12 +0000 http://gunnuts.net/?p=4792#comment-14356 Apples and Oranges. The poweder in a 22WMR is a bit slower burning and has less puresure than the 5.7. Its just a fact. Now, in a rifle length (16"), then the come out almost equal. Maybe 100fps towards the 5.7, but, they use almost the exact same bullet. I know this first hand as that hornady and cci/speer both make bullets for the 22WMR and 5.7. Its the case, powder, and primer that are different. Which changes the pressure and burn rate. Yes, I plan to get a PMR-30, as I have been waiting on getting a 22WMR pistol for quite some time and like the quality/service from Kel-Tec. Apples and Oranges.

The poweder in a 22WMR is a bit slower burning and has less puresure than the 5.7. Its just a fact.

Now, in a rifle length (16″), then the come out almost equal. Maybe 100fps towards the 5.7, but, they use almost the exact same bullet.

I know this first hand as that hornady and cci/speer both make bullets for the 22WMR and 5.7.

Its the case, powder, and primer that are different. Which changes the pressure and burn rate.

Yes, I plan to get a PMR-30, as I have been waiting on getting a 22WMR pistol for quite some time and like the quality/service from Kel-Tec.

]]> By: Frank W. James http://gunnuts.net/2009/11/23/22-mag-vs-5-7x28mm/#comment-14355 Frank W. James Tue, 24 Nov 2009 00:01:35 +0000 http://gunnuts.net/?p=4792#comment-14355 I think you might be on to something if you use 10% ballistic gelatin in your testing. Comparing penetration depths and cavity sizes might actually point out some differences........er, or they might be differences of extremely small degrees. All The Best, Frank W. James I think you might be on to something if you use 10% ballistic gelatin in your testing. Comparing penetration depths and cavity sizes might actually point out some differences……..er, or they might be differences of extremely small degrees.

All The Best,
Frank W. James

]]> By: Joe Huffman http://gunnuts.net/2009/11/23/22-mag-vs-5-7x28mm/#comment-14354 Joe Huffman Mon, 23 Nov 2009 22:52:14 +0000 http://gunnuts.net/?p=4792#comment-14354 At normal pistol distances the more aerodynamic bullet won't make a noticable difference in impact velocity. It will, of course, affect the terminal performance. But unless the 5.7 bullet is designed to expand rather than be "armor piercing" the .22 Mag is probably going to have the edge on wounding potential. At normal pistol distances the more aerodynamic bullet won’t make a noticable difference in impact velocity. It will, of course, affect the terminal performance. But unless the 5.7 bullet is designed to expand rather than be “armor piercing” the .22 Mag is probably going to have the edge on wounding potential.

]]> By: Jake http://gunnuts.net/2009/11/23/22-mag-vs-5-7x28mm/#comment-14353 Jake Mon, 23 Nov 2009 22:23:47 +0000 http://gunnuts.net/?p=4792#comment-14353 That reply as "riposte3" was me posting from my phone, BTW. I didn't realize it used a different name until just now. That reply as “riposte3″ was me posting from my phone, BTW. I didn’t realize it used a different name until just now.

]]> By: MCSA56 http://gunnuts.net/2009/11/23/22-mag-vs-5-7x28mm/#comment-14352 MCSA56 Mon, 23 Nov 2009 22:03:45 +0000 http://gunnuts.net/?p=4792#comment-14352 BTW - <a href="http://www.brassfetcher.com/" rel="nofollow">Brass Fetcher</a> has some gelatin test of both 22WMR and 5.7. Just something I stumbled across; not quite what you're looking for, but neat... BTW –

Brass Fetcher has some gelatin test of both 22WMR and 5.7.

Just something I stumbled across; not quite what you’re looking for, but neat…

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