5.7x28mm vs 4.6x30mm - Arms Locker
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Old 09-08-2018, 08:44 AM   #1
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5.7x28mm vs 4.6x30mm

Hey guys, I’m a new user, but I’m pretty experienced with firearms, and I wanted to ask, what are the benefits of 5.7mm vs 4.6mm? I own a Five-seveN with my own handloaded ammunition, and I did some research, and it seems ballistics and performance wise, the 5.7mm is superior in numerous ways. I wanted to get your opinion, please let me know what you think on this topic!
 
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Old 09-09-2018, 06:26 PM   #2
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For us regular people who want a modern PDW round yes the 5.7 is a much better choice and there are more platforms it their for it.
That 4.6 round so far seems regulated to HK only firearms?

Then as you mentioned reloading 4.6mm is what .18 roughly?

From a civilian standpoint 5.7 would be my pick and I've eyed it off and on.
 
Old 09-10-2018, 07:15 AM   #3
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I donít own either one, but of the two, Iíd agree that youíre farther ahead in todayís market with the 5.7 as you say.

That said, if I were going to be pursuing that type of weapon or caliber (ie, small, high-velocity caliber in a pistol-size cartridge case) Iíd be sorely tempted to go with .22TCM instead of either of those. I somewhat accidentally ended up with a one; a low end RIA double-stack 1911 (2011..?) in the caliber, simply because it came as part of a kit; I ordered a gun in 9mm, and it came with the 22TCM barrel & spring as well.

Iíve only put ~200-300 rounds or so thru it, but itís actually pretty impressive. Thereís pretty much zero recoil; using only something like a 6-lb recoil spring iirc. From my gunís 5Ē barrel, it runs a 40-grain bullet at 2,080fps. From a carbine, it supposedly runs around 2,700fps. Guys who reload it (I donít yet, and donít know that I will) are getting 2,500 fps from a 1911 using (iirc) LilGun powder; I have no idea what they get from carbines with handloads. But more than 2,000fps from a 1911 or glock 17 is impressive imo.

Three things really impressed me about it compared to the 5.7 and 4.6 pdw calibers. First, is that even from a 5Ē 1911 pistol barrel, it slightly exceeds both the 5.7 and the 4.6; even when firing the 4.6 thru a longer 7Ē pdw barrel and the 5.7 thru a 10.5Ē barrel. Second is that it has the same OAL as a .45acp round, so it can fit in any .45acp-size gun. And third is the later-released loading that actually shares the same OAL as a 9x19 cartridge, meaning that we can get Five-seveN ballistics from a 1911 or from a glock either one.

Iím not really ďupĒ on any of the three, other than a little playing with the TCM. But definitely agree with you on the 5.7 being a better choice than the 4.6, at least at this point in time. Th 4.6 is a little cheaper to shoot, but as I understand it thereís not as many ammo options or accessories as the 5.7 has available for it.
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Old 09-10-2018, 05:15 PM   #4
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John,

A question on the.22TCM ammunition. Where is it made?

I've looked at it too but it's still only available from Armscor correct?

Not knocking it and I like the fact that it can be had in two platforms I'm very familiar with. I also could build up a Glock type PDW with arm brace if I wanted to. HMmmmm.

I just want more than one source for ammo/brass.
 
Old 09-10-2018, 06:03 PM   #5
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All that I’ve bought is armscor, and it’s been probably over a year since I bought any; the gun mostly has 9mm thru it. Don’t know if armscor is the only source or not.

They also came out with a 39-grain load with the bullet seated deeper, so oal was shorter; the same as 9mm instead ot 45acp. And they offered a glock conversion kit, so you could get the pdw type ballistics from a typical carry pistol.

Might try ammoseek or similar to see what all amo options are out there now. I rarely use the caliber and haven’t looked lately.
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