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?