Norc 311 question

1 in 12 would be the common answer you will find. Mine doesn't stabilize 55g projectiles unless they are factory ammo or max charged reloads. I dicked around with it and pulled a very tight patch through many times and repeatedly came up with 1 in 14. That number also seems to make more sense according to the way it behaves with chronographed ammo. The 1 in 12 may come from the fact it is supposed to be an A1 clone which IIRC was 1 in 12. I load full power reloads for it and don't care now :D That and the fact it doesn't get fired anymore because I don't really know where I hid it last.


Cheers
 
1 in 12. I've never had a problem stabalizing 55 grain ammo but then I only shoot factory loads. I used to love that Norinco 5.56 ammo (yellow box), it seemed to have more power but was dirty as hell and stung your nostrils for a while.

Anyone have any?

Jeff
 
I believe the very first A1's had a 1 in 14 twist, that was changed to 1-12 to better stabilize the 55 grn round in high humidity, or other adverse balistic conditions. They may have copied that. Just a guess :confused:
 
Ok, so next question is what factory ammo do the 311 owners out there find works best? What grain? Any info appreciated.
 
Mine would feed any 55gr with no problems,i even tried some 62gr.But i was only shooting at 100m,longer than that and i think you run into tumbling issues.
 
CZ Man said:
Ok, so next question is what factory ammo do the 311 owners out there find works best? What grain? Any info appreciated.
Click to expand...

American Eagle 55gr
Winchester white box 55gr
Norinco 55gr

I should think anything less than 60gr would stabalize but I don't know since shape is as much a factor as weight.

Check out the ar15.com ammo oracle.

Jeff
 
I would not recommend using hollow points. They have been known to catch and get driven deeper into the case causing pressure spikes and a few explosions.
 
Couldn't handle it any longer, dug out the Norc 311 and measured the twist.
Flattened out a brass pull through loop and filed it flat and squared so it fit barely between the lands and could not slip. Definately 1 in 12.

Cheers
 
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