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-   -   question (http://www.firearmstalk.com/forums/f20/question-13773/)

sharp_briar 05-11-2009 11:55 AM

question
 
I am new to the ar15 I know absoulutly nothing about them. Mine is a stag looks like the model 6 and all but says model 15 on it. 24" bull barrel .223 and all. I had some cheap ammo here that I used in a ruger mini 14(62gr) and it didnt group real well.(wouldnt group in a pie plate) I got some better ammo and alittle heavier (77 gr) I got to shoot 4 rounds and it had started to rain. Those 4 rounds measures 3/8" and I was impressed and satisfied. I was wondering if anyone else had trouble with the lighter bullets. thanks for any info

60tbird 05-12-2009 02:36 AM

You need to check the twist of your barrel. That will determine what weight bullet to shoot in that barrel. It sound like you need to shoot from 69 grain bullets up.

Dillinger 05-12-2009 01:41 PM

I am inclined to agree. What is the twist rate of the barrel you are using?

JD

RL357Mag 05-12-2009 05:44 PM

Who made your "cheap ammo"? 62gr. should be heavy enough to group well within 2". But "pie-plate" accuracy sounds like Wolf or steel-cased crap. My bull barreled RRA doesn't group well with factory 55 gr. Remington FMJ's, but it definately keeps them within 2" at 100 yds. Moving up to 68 and 69gr. reloads tightens it up to well under an inch. The twist on that gun is 1:8". Also, is that cheap ammo labelled 5.56 or .223?

sharp_briar 05-13-2009 12:32 AM

Thanks for the replies the "cheap ammo" I am using is brown bear 62 gr bimetal sp lacquered case. I relize it was cheap ammo but didnt relize it was junk I guess I got what I paid for.

RL357Mag 05-13-2009 01:01 AM

Quote:

Originally Posted by sharp_briar (Post 105585)
Thanks for the replies the "cheap ammo" I am using is brown bear 62 gr bimetal sp lacquered case. I relize it was cheap ammo but didnt relize it was junk I guess I got what I paid for.

The real issue is it's not just "junk", but it could be problematic junk. Most AR manufacturers warn against the use of steel cased laquer-coated ammo. Under the press. & temps sustained in the chamber, the laquer has been known to melt and transfer to the chamber walls thereby decreasing the chamber dimensions and making FTE and stuck cases a real pain. Also since steel does not expand and contract as much and as rapidly as brass, the fired case does not grip the chamber walls like a brass case and can slam the bolt face causing damage over time. You might think about using your chamber brush judiciously with something like gun scrubber or laquer thinner to remove any deposits depending on how many rounds you've put through your rifle.


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