Ceiner conversion - accuracy > AR Discussions

Posted: 3/14/2007 8:57:08 PM EDT

I tried out my new Ceiner conversion tonight on a 50' indoor range.
The results were mixed -- a lot of the rounds were pretty much in a nice tight (touching holes) group.

However, a number of rounds were significantly low and slightly left, a string of them from an inch or so low to maybe six inches low -the line of them at ~ 35minutes past the hour.

I tried a new target, and had the same results.

Anyone any suggestions? Or are they all like this?

Posted: 3/14/2007 9:21:08 PM EDT

[#1]

So let me get this straight...Different ammo...shot differently?

Posted: 3/15/2007 6:22:30 AM EDT

[#2]

No, same ammo.
CCI Mini-Mag standard velocity.

Posted: 3/15/2007 6:57:39 AM EDT

[#3]

Quoted:
I tried out my new Ceiner conversion tonight on a 50' indoor range.
The results were mixed -- a lot of the rounds were pretty much in a nice tight (touching holes) group.

However, a number of rounds were significantly low and slightly left, a string of them from an inch or so low to maybe six inches low -the line of them at ~ 35minutes past the hour.

I tried a new target, and had the same results.

Anyone any suggestions? Or are they all like this?

Any indication that the rounds were keyholing? There's sometimes an issue with .22LR in a .223 barrel with too fast a rifling twist. An older barrel with 1 in 12 twist should be OK, but a 1 in 9 or 1 in 7 could be too fast a twist to properly stabilize the .22LR.

Posted: 3/15/2007 7:16:38 AM EDT

[#4]

your AR bore is bigger than the bore of a .22LR rifle. The conversion kits arent for accuracy, they are for plinking.

Posted: 3/15/2007 9:47:33 AM EDT

[#5]

I thought that a twist can be too slow to stabilize a bullet, but that it can't be too fast. That it can't be over-stabilized...can anyone else comment on that?

Posted: 3/15/2007 10:41:43 AM EDT

[#6]

Quoted:

Quoted:
I tried out my new Ceiner conversion tonight on a 50' indoor range.
The results were mixed -- a lot of the rounds were pretty much in a nice tight (touching holes) group.

However, a number of rounds were significantly low and slightly left, a string of them from an inch or so low to maybe six inches low -the line of them at ~ 35minutes past the hour.

I tried a new target, and had the same results.

Anyone any suggestions? Or are they all like this?

Any indication that the rounds were keyholing? There's sometimes an issue with .22LR in a .223 barrel with too fast a rifling twist. An older barrel with 1 in 12 twist should be OK, but a 1 in 9 or 1 in 7 could be too fast a twist to properly stabilize the .22LR.

I use my Ciener conversion in my LMT 1/7. I have shot 29gr, 36gr & 40gr with 700fps to 1750fps rounds with very good results. From 10yards to 50yards never key holed once only the most perfect 22cal holes you could ever shoot.

I have a blast snipping turtles with it. My Ciener has functioned flawlessly with every round fired designed to work in a simi auto. I never polished anything and I hardly use any lube.

Posted: 3/15/2007 11:14:40 AM EDT

[#7]

Quoted:

Quoted:
I tried out my new Ceiner conversion tonight on a 50' indoor range.
The results were mixed -- a lot of the rounds were pretty much in a nice tight (touching holes) group.

However, a number of rounds were significantly low and slightly left, a string of them from an inch or so low to maybe six inches low -the line of them at ~ 35minutes past the hour.

I tried a new target, and had the same results.

Anyone any suggestions? Or are they all like this?

Any indication that the rounds were keyholing? There's sometimes an issue with .22LR in a .223 barrel with too fast a rifling twist. An older barrel with 1 in 12 twist should be OK, but a 1 in 9 or 1 in 7 could be too fast a twist to properly stabilize the .22LR.

I use my Ciener conversion in my LMT 1/7. I have shot 29gr, 36gr & 40gr with 700fps to 1750fps rounds with very good results. From 10yards to 50yards never key holed once only the most perfect 22cal holes you could ever shoot.

I have a blast snipping turtles with it. My Ciener has functioned flawlessly with every round fired designed to work in a simi auto. I never polished anything and I hardly use any lube.

Posted: 3/15/2007 11:51:55 AM EDT

[#8]

Quoted:
I thought that a twist can be too slow to stabilize a bullet, but that it can't be too fast. That it can't be over-stabilized...can anyone else comment on that?

Same as I've been told. Only worry is - to light of construction of projectile can cause jacket separation and disintegration using the .223 varmint loads, but thats for the 1:7 & 1:8 twists. Shouldn't ever be an issue with .22 LR rounds.

Posted: 3/15/2007 12:11:21 PM EDT

[#9]

Standard .22LR twist is 1:16. A twist of 1:7 is way faster. Plus the issue of I think .001 difference in bore diameter is going to complicate matters. Try some different ammo. I'm going to be in the same boat as I just ordered a Ciener unit 5 minutes ago. But, I have a 1:12 pencil barrel to try in addition to 1:9.

Posted: 3/15/2007 12:39:59 PM EDT

[#10]

Thanks for all the feedback.

One item I didn't mention is the .22 can attached to the gun.
I am now leaning towards the idea that there might have been *just* a fraction of baffle strike -- that would explain why always the same direction, and 6" off at 50' !!!

When there was no problem, all the bullet holes were round, and touching each other.

I think I need to try again, without the can and see what happens.

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