5.7x28

Happened to come across 5.7x28 load data today.

Have a friend that picked up an AR-57 upper a while back and talks about how accurate & easy it is to shoot.

I had never really looked at the round before.

Both the 5.7x28 and the .223 use .224 bullets, and there is data for both using the 40-gr Hornady V-Max bullet (which is the 5.7 factory round, SS197SR).

Looking at the reloading data for the .223 - the 40-gr V-Max can be pushed to 3,737 fps.

In the 5.7, the same 40-gr V-Max can only be pushed to 1,875 fps.

So, other than being able to carry an extra 20 rounds per magazine - is there something that makes the 5.7 a better round in the carbine platform?

Think I want to load up some for my 20" heavy target barrel AR and see what it can do.

Also want to see what the load will do out of a 12VLP.

Both barrels have 1:9 twist.

Anybody got any trigger time with this bullet in .223?

hey they have once fired brass at this sit i ran into I have no idea what it is new but here you go http://shop.topgunss.com/57x28-Brass...57x28-1000.htm

1875 FPS is typically the speed listed when fired from the FN Five-seveN pistol. It should be around 2400 fps or so from a rifle. It won't ever run with a .223 Rem, so no advantge in a carbine as far as ballistic performance. It is really good at what it was designed to do though, provided interchangeble ammo between rifle and handgun for LE/Military. The handgun fully loaded (20 + 1 rounds) is extremely light (think empty Glock 22 weight).

Next time I have my Five-seveN out I will try to chrono it. It is what stays loaded in the GunVault in the night stand. My wife loves the light weight and very low recoil.

Yeah, I can see the advantage of interchangeablitity (if that's a word) for carrying both rifle & pistol with same round - think back to the cowboys with .44WCF.

And there's no question the 5.7 is an effective round.

I do like the fact that the Five-seveN holds 20 rounds, and with minimal recoil.

Was not familiar with the round and after doing some research I can't see myself buying either a carbine or AR-57 upper.

Wouldn't mind having the Five-seveN, but finding factory ammo in my local areas is a PITA.