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Posted: 1/25/2006 7:21:21 PM EDT
There are frequent questions posted regarding 1-9 twist barrels and their ability to stabilize heavy bullets. Wanted to share some range results from last weekend. Shot my 1-9 twist, chrome lined, lightweight contour, standard trigger and sights, 16" carbine. It's a kit gun from J&T built on a Stag lower. I was practicing with my service rifle (High Master, Distinguished) and decided to see what the carbine would do. Used my standard 200/300 load of 24gr RL15, LC brass, Rem 7 1/2 primer and a 77gr Sierra. At 200 yards the carbine produced a 98-4x and 97-3x. At 300 yards it produced a 96-1 and a 97-2. For those unfamiliar with the highpower targets, these groups translate into approximately head sized groups. And for those concerned with lower temperatures affecting stabilization in a 1-9 barrel, the temperature was 35 degrees.
Link Posted: 1/25/2006 7:30:41 PM EDT
[Last Edit: 1/25/2006 7:35:50 PM EDT by theshootersden]
Thanks for sharing...

I always had good results using 75 grain with a 16" 1:9 twist barrel... I honestly believe that those people that cant achieve the same has ability or barrel issues...


ETA: Using the longer heavier bullets with a 16" 1:9 twist barrel might not have that "tack driver" MOA capabilities, but it'll shoot minute of man with out any trouble...
Link Posted: 1/25/2006 7:34:31 PM EDT
it is not uncommon for some of the "value" barrels to not be exactly what they are said to be, I have had great luck with 1:9 and 75gr, but I have also seen barrels that were supposed to be 1:9 that are actually much closer to 1:10 -- that inch can be a big difference.

But, I would have to agree that I am sure many of the negative comments about the 1:9 are really based on hearsay.
Link Posted: 1/25/2006 7:41:14 PM EDT

Originally Posted By Gunzilla:
it is not uncommon for some of the "value" barrels to not be exactly what they are said to be, I have had great luck with 1:9 and 75gr, but I have also seen barrels that were supposed to be 1:9 that are actually much closer to 1:10 -- that inch can be a big difference.

But, I would have to agree that I am sure many of the negative comments about the 1:9 are really based on hearsay.



I have to totally agree...

Any TRUE 1:9 twist, well made barrel will stabilize the longer, heavier 75 grain bullets...
Link Posted: 1/26/2006 5:08:44 PM EDT
Link Posted: 1/27/2006 12:18:23 AM EDT

Originally Posted By freefloat:
There are frequent questions posted regarding 1-9 twist barrels and their ability to stabilize heavy bullets. Wanted to share some range results from last weekend. Shot my 1-9 twist, chrome lined, lightweight contour, standard trigger and sights, 16" carbine. It's a kit gun from J&T built on a Stag lower. I was practicing with my service rifle (High Master, Distinguished) and decided to see what the carbine would do. Used my standard 200/300 load of 24gr RL15, LC brass, Rem 7 1/2 primer and a 77gr Sierra. At 200 yards the carbine produced a 98-4x and 97-3x. At 300 yards it produced a 96-1 and a 97-2. For those unfamiliar with the highpower targets, these groups translate into approximately head sized groups. And for those concerned with lower temperatures affecting stabilization in a 1-9 barrel, the temperature was 35 degrees.





You got any idea on what the muzzle velocity for the above handload is from a typical 16" length barrel? TIA.
Link Posted: 1/27/2006 1:34:51 PM EDT
The load does 2675fps out of a 20" barrel. I would guess 2600fps out of a 16".
Link Posted: 1/27/2006 1:41:05 PM EDT
How much more lethal is 75 grain over SS109 in a 16" HBAR?
Link Posted: 1/27/2006 8:17:26 PM EDT

Originally Posted By freefloat:
There are frequent questions posted regarding 1-9 twist barrels and their ability to stabilize heavy bullets. Wanted to share some range results from last weekend. Shot my 1-9 twist, chrome lined, lightweight contour, standard trigger and sights, 16" carbine. It's a kit gun from J&T built on a Stag lower. I was practicing with my service rifle (High Master, Distinguished) and decided to see what the carbine would do. Used my standard 200/300 load of 24gr RL15, LC brass, Rem 7 1/2 primer and a 77gr Sierra. At 200 yards the carbine produced a 98-4x and 97-3x. At 300 yards it produced a 96-1 and a 97-2. For those unfamiliar with the highpower targets, these groups translate into approximately head sized groups. And for those concerned with lower temperatures affecting stabilization in a 1-9 barrel, the temperature was 35 degrees.



Well, I have to admit it's not the first time, but I'm confused!! Being fairly new to AR's, I thought that the 1-9 twist was NOT fast enough for "heavy" bullets (over 55gr.). So I was quite surprised to find that my Russian surplus 62gr bought by accident was more accurate than various other lighter bullets...

What IS optimum weight for factory 20", 1-9 bbl with factory loads (I'm not able to get back into handloading at this time)?

Thanks!
Arden
Link Posted: 1/27/2006 8:36:28 PM EDT
I have an old Colt with 1-7 twist 16" skinny barrel. How will that work on the heavier bullets?

Not new to the AR here, but I don't have much experience with different loads. I have been shooting 55gr.
Link Posted: 1/27/2006 8:41:22 PM EDT

Originally Posted By freefloat:
There are frequent questions posted regarding 1-9 twist barrels and their ability to stabilize heavy bullets. Wanted to share some range results from last weekend. Shot my 1-9 twist, chrome lined, lightweight contour, standard trigger and sights, 16" carbine. It's a kit gun from J&T built on a Stag lower. I was practicing with my service rifle (High Master, Distinguished) and decided to see what the carbine would do. Used my standard 200/300 load of 24gr RL15, LC brass, Rem 7 1/2 primer and a 77gr Sierra. At 200 yards the carbine produced a 98-4x and 97-3x. At 300 yards it produced a 96-1 and a 97-2. For those unfamiliar with the highpower targets, these groups translate into approximately head sized groups. And for those concerned with lower temperatures affecting stabilization in a 1-9 barrel, the temperature was 35 degrees.



What I find even more amazing is that you have been a member here at ARFCOM since 2001 & you only have 7 POSTS!!!
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