Norinco 10.5 CQB CHEEP vs EXPENSIVE AMMO GROUPING TEST WITH PICS…

R

rocco

CGN frequent flyer
EE Expired
Rating - 100%
5   0   0
Location
GTA East
Norinco 10.5 CQB CHEEP vs EXPENSIVE AMMO GROUPING TEST WITH PICS…

STRAIGHT TO THE POINT : Norinco 10.5 with a TRS-25 1:9 twist using froglube in -20 to -30 with no problems

I am won my first ORA CQB Match last year and decided to try and get my groupings a little tighter… ( I used Norinco bulk )
My red dot has a 25 yard ZERO….
I did a 5 round grouping in 3 sec with my mag resting on the bench sitting down at 30 yards…
I was aiming/holding at the black dot….
I am trying to simulate a real world match grouping with a little extra help from the mag resting to take-up some shooter error…

It is very interesting to see how the heavy bullets were grouping up and right….some looked sideways….

AE XM855 62
WINCHESTER 64
AE 55
HORNADY ZOMBIE MAX 55
FUSION 62
HORNADY MATCH BTHP 75
NORINCO BULK 55
WINCHESTER 62
FIOCCHI 69 SMK
FIOCCHI 77 SMK

~~~( I tried to do a 100 yrd grouping but failed do to the red dot not having any zoom to get a consistent hold on target…part 2 )~~~


I hope this helps out CGN somehow lol…. Have a great weekend !!!!!


firearm is unloaded….

 
Last edited:
No surprise about the heavies having oblong holes...wouldn't be stable coming out of that short barrel.

*Edit* The 75/77 gr bullets would likely be marginally stable in warm weather but not in this cold.
 
Last edited:
It was not the cheapest test but I had to see for myself how the Light vs Heavy ammo was effected from the 10.5 1:9 twist….lol
 
Only way to find out...the heavies may be great on hot humid days, the 10.5" barrel is probably a little short to get optimum velocities needed for the 1 in 9 though.

55 gr V-Max handloads were magic in my AR.
 
redshooter said:
No surprise about the heavies having oblong holes...wouldn't be stable coming out of that short barrel.

*Edit* The 75/77 gr bullets would likely be marginally stable in warm weather but not in this cold.
Click to expand...

Matches are held from -30 to +30 and so far the Norinco ammo has help up to the test… I do get double feed from it sometimes… Is it worth the savings ? mabie… But the accuracy have been great for the cost...
 
Mr. Bjorn said:
Posts like these remind me why I generally love this site. Thank you for the investment of your time and money :)
Click to expand...

Thank you Mr.Bjorn !!!!! After reading blogs, forums, youtube videos for years I had to add a litre something to the Gunnutz Science tests lolol…. at least in the CQB world...
 
Thank you for your time and effort! I am a Norc Fan as well. I don't know if this helps for your reference chart, but last week I managed to squeeze 2MOA (shooting at 100 yards) using Norc Ammo, my DA 556 14.5", Eotech sight (1MOA dot) and 3x Magnifier shooting from a bench off sandbags.

I was so excited I kept the target. I forgot to get the RO to sign it for validity purposes so I'm taking the paper target back to the range this week to have it signed off on. LOL.
 
Tigerbalm said:
Thank you for your time and effort! I am a Norc Fan as well. I don't know if this helps for your reference chart, but last week I managed to squeeze 2MOA (shooting at 100 yards) using Norc Ammo, my DA 556 14.5", Eotech sight (1MOA dot) and 3x Magnifier shooting from a bench off sandbags.

I was so excited I kept the target. I forgot to get the RO to sign it for validity purposes so I'm taking the paper target back to the range this week to have it signed off on. LOL.
Click to expand...
Thank you Tigerbalm !!!! I am getting a 3x to test it at 100.... The red dot alone was not enough...
 
Island_Craig said:
You think 1:7 would tighten that up ?
Click to expand...

I believe the length of the barrel is the issue in choosing accurate ammunition.... Then again you need to find the right one... Everyone said 1:9 is good for up to 69.... That looks like it would suit a 14-18 in AR...
 
rocco said:
It is very interesting to see how the heavy bullets were grouping up and right….some looked sideways….
Click to expand...

The heavier bullets will have longer barrel time, allowing the muzzle to climb and shift right during recoil more so than the lighter rounds. I've seen big differences between 180 and 150 grain rounds in 303 British, and I believe that's what you're experiencing here to a lesser degree.

You are a right handed shooter?

Nice thread, thanks for posting all this information.
 
Where the barrel length and twist come into play is in bullet stability. The heavy HPBT's need to be spun harder to stabilize, especially in the cold/dense air. I have no problems with stability for 75 gr Hornady HPBT's in my 1 in 9 24" barrel, but they are leaving at about 2800 FPS. Steel Match has 2750 listed on the side for a 24" barrel (if I'm not mistaken). I wouldn't expect it to be much more than 2400 FPS in a 10.5" barrel. That doesn't meet worst case standards according to Bryan Lytz's work on bullet stability if it's at or below 0 degrees f.

Note the 77 gr SMK's and the 75 HPBT's are the biggest groups by a long way and many of the holes are oblong. At 100 yds those groups would probably be huge and maybe even a keyhole or two.
 
Last edited:
SoBored said:
The heavier bullets will have longer barrel time, allowing the muzzle to climb and shift right during recoil more so than the lighter rounds. I've seen big differences between 180 and 150 grain rounds in 303 British, and I believe that's what you're experiencing here to a lesser degree.

You are a right handed shooter?

Nice thread, thanks for posting all this information.
Click to expand...

I will put a note to try shooting left and right…..thanks lol
 
You must log in or register to reply here.
Back
Top Bottom