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Posted: 10/13/2011 6:16:19 PM EDT
Best Grain for .223 1:7 twist 16" Barrel

What would be the best grain weight for 100-200 yard shots from this setup and barrel twist?

Can you use 55 grain and still be accurate without tearing up the barrel?

Thanks.
Link Posted: 10/13/2011 6:22:05 PM EDT
[Last Edit: 10/13/2011 6:23:06 PM EDT by RedFalconBill]
Whatever your barrel shoots best. This question should be in the Ammo Forum, not Troubleshooting.

Read the AR15 Ammo Forum FAQs

ETA: I like shooting Black Hills Ammo (Red or Blue box), to see how accurate my rifle is.
Link Posted: 10/13/2011 6:34:34 PM EDT
55 grain bullets are no more "damaging" to you barrel than are 69 grain bullets.

As a matter of personal observations, 55 grains shoot fine from my 16" 1/7 carbines.





Good luck,
Bill
Link Posted: 10/13/2011 6:41:53 PM EDT
apoligies, couldn't decide whether to put it in troubleshooting, ammo or barrels and accesories.
Link Posted: 10/13/2011 6:42:58 PM EDT
And thanks Bill,

That is what I have been shooting then one of my buddies said my twist was not compatable with the 55 grain. Stupid friends.
Link Posted: 10/13/2011 6:52:41 PM EDT
[Last Edit: 10/14/2011 9:53:48 AM EDT by RedFalconBill]
Originally Posted By jackthewall75:
And thanks Bill,

That is what I have been shooting then one of my buddies said my twist was not compatable with the 55 grain. Stupid friends.


Might be that your friends were reading/listening to crap, and just regurgitating it.

Then again, they might be stupid.

The only ammo I would have reservations shooting in a 1/7" twist would be the light (40gr and 45gr) thin jacket bullets (Sierra's Blitz, Hornady's SX and V-Max). Other than these, let the bullets fly!
Link Posted: 10/13/2011 7:26:02 PM EDT
Thanks Bill, just wanted to make sure before I ordered 1000 rds or 55 gr
Link Posted: 10/13/2011 9:31:46 PM EDT
Just remember the relationship between bullet length (which we equate to weight) and twist: longer (heavier) bullets need more stabilization in the form of faster twist.

1:7 will stabilize the heavies (77gr) and lighter; as WFB stated, 1:7 may overstabilize (spin too fast) the lightest bullets available, but probably not.

On the other hand, slower twists, 1:8, 9, 12, et al may not stabilize the heavier bullets and at some point, rifle dependent, accuracy may drop off as you go up in bullet weight.

Also, the original M16 had a 1:12 twist for 55gr bullets.
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