I would expect 7" at 100y.
Anymore and it's gravy!
It is currently the cheapest 223/556 ammo out there by a fair margin, made in china with the loosest possible spec.
But then again, I've never had North American made plinking ammo under 5" either......
Ymmv!
It really depends on which rifle you're shooting it out of.
The primers are hard as all get out and if your rifle doesn't have a strong enough fireing pin spring or striker spring, you will get misfires and inconsistent ignition.
I have a CZ527, that shoots the Norinco into sub 1/2 groups at 100 yards.
I have pulled the bullets and they all weigh within .2 grains of each other. The powder charge is 26.8 grains plus or minus a two tenths of a grain, of ball powder.
I also drove out the primers and replaced them with CCI small rifle magnum primers. My Tikka T3, Remington Mod 7 and Marlin XCR put 10 rounds into ragged sub .75in holes.
I will admit, those primers are a real issue. If you don't mind pulling all of the bullets and reweighing the powder/replacing the primers, it is very good stuff.
It works fine in my 1977 dated Mini 14. Goes bang every time and shoots into 2 1/2 inches at 100 yards. Good for a standard Mini 14.
The real caveat with this Norinco ammo is the primers. It really needs a hard, solid whack to get consistent ignition and therefore decent accuracy. Of my bolt actions, the only rifle that gives me reliable and consitent primer strikes is my CZ257. A friend has a Rem 700 that has a heavy spring as well and it shoots nice tight little groups as well.
Some Mini 14s don't seem to have enough spring tension behind the hammer to strike the primers hard enough either.