This is what I used to measure the base to shoulder dimensions of the ammo. When the zeros line up on the mic, the case is at the minimum ANSI level of dimension "A" as shown in the pic. Substitute the 30-06 numbers in the drawing with the .223 numbers, 1.4636 min to 1.4736 max. The case in the pic (Q3131) is .003" smaller than minimum.
Now for the data.
20 rounds measured unless noted otherwise.
RCBS Precision MicUsing the mic and 1.464" as the minimum dimension A.
Shortest - 1.458"
Longest - 1.462"
Extreme spread .004'"
All rounds were under the minimum spec.
I also took all 20 rounds and dropped them into 2 barrels(one Bushy 5.56 and an Model 1 Sales 5.56 chamber) and tried to rotate a stripped bolt on them. Bolt locked up with ease.
Cartridge over all lengthRecommended OAL 2.260"
Shortest loaded round - 2.245"
Longest loaded round - 2.250"
E.S. - .005"
All rounds were under spec.
Loaded round weightLightest round - 178.6 grains
Heaviest round - 184.0 grains
E.S. - 5.4 grains
Empty case weightLightest case - 99 grains
Heaviest case - 103 grains
E.S. - 4 grains
Empty case length10 rounds measured
Shortest case - 1.749"
Longest case - 1.755"
E.S. - .006"
All under maximum case length of 1.760"
Powder charge weight10 rounds measured
Lightest charge - 24.7 grains
Heaviest charge - 25.2 grains
E.S. - .5 grain
Projectile weight10 rounds measured
Lightest tip - 54.5 grains
Heaviest tip - 55 grains
E.S - .5 grains
Bullet diameter10 rounds measured
.2235" to .224"
Chronograph data10 shots fired @ 65 degrees F.
16" Bushy M-4
Low - 2976 fps.
High - 3137 fps.
Avg - 3036 fps.
E.S. - 161 fps.
S.D. - 47.22
In order of firing:
3058
3000
3010
3014
3015
3048
3015
3084
2976
3137
Well those are the numbers I came up with on a sampling of 20 rounds. YMMV
The only thing that has me concerned is the extreme spread of the powder charge. The one half grain varience could easily explain the high extreme spread in velocity figures.
You guys can formulate your own opinions. I will neither recommend for or against using this ammo.
The fine print: I aint responsible for nothin'
PS. My head hurts.