223 9twist
- Thread starter peterf225
- Start date
Have owned several 9 twist .223 rifles. Great with 69s, marginal with 75s.
peterf225
Silver $$ Contributor
Let me add a little more info. I am looking at building an AR with a 16" 9twist barrel and looking to coyote hunt with it. My max range will be 400yds. I want to be able to shoot deer with it also. Have heard good things about the 62gr barnes triple x and also the 70gr barnes triple x but don't know if it would shoot the 70 gr. Any help would be appreciated. Thanks.
It should handle the 70gr. bullets, I have seen 75's come out of a 16" barrel as well.
That's odd...did you work up loads or just throw some thing together to shoot?
I have run 77 gr. Sierra Match Kings through every 1-9" barrel I've owned (single loading as they are long) and they worked FINE, once in a Match I "cleaned" the 300 yd. MR-63 with a 800-61X, I think I'll stick with what I know.
I have run 77 gr. Sierra Match Kings through every 1-9" barrel I've owned (single loading as they are long) and they worked FINE, once in a Match I "cleaned" the 300 yd. MR-63 with a 800-61X, I think I'll stick with what I know.
I did not work up anything special. A group of us were testing a variety of factory loads just to see how they would group in a Ruger 1-V. So nothing special except we were suprised the 77gr were so different from everything else. Apparently, according to members of the Ruger #1 website, similar results were experienced by others. However, if one makes an effort to find the right handload, many have had more success with the heavier bullets. Most found best success using under 70 gr bullets--but these results may just be coincident to the Ruger #1.
jonbearman
I live in new york state,how unfortunate !
what happened with ar 1-7 barrel? I thought the faster twist would stabilize better?
Depends on the velocity, RPM is the ultimate deciding factor of stability. If you can get the velocity high enough to reach the needed RPM it'll stabilize. A 75 VLD stabilizes in my AR above 2700, below that it key holes.
The Barnes will need more RPM per given weight than most other bullets of the same weight because Barnes will be longer than most others of a given weight because copper weighs less which means the bullet has to be longer to reach the same weight, a longer bullet requires a faster twist.
How do you know ultimately? Shoot it.
For 400 yards like you're saying I'd go with a 60 Nosler Ballistic Tip though, they have a good BC and shoot flat and are accurate and should work well on coyote.
The Barnes will need more RPM per given weight than most other bullets of the same weight because Barnes will be longer than most others of a given weight because copper weighs less which means the bullet has to be longer to reach the same weight, a longer bullet requires a faster twist.
How do you know ultimately? Shoot it.
For 400 yards like you're saying I'd go with a 60 Nosler Ballistic Tip though, they have a good BC and shoot flat and are accurate and should work well on coyote.
k80skeet
Silver $$ Contributor
My( 2) 223 both with 1 in 9 twist shoot far better with the 69 & 70 gr bullets than with the 75's& 77's not that the heavier don't shoot ok but the groups are far smaller with the 69gr & 70gr and that is true all the way out to 500yds they are better at every distance.
I've used the 52-3TSX on deer with my 20" 223AI and it works very well.
The load is a fireforming load over Benchmark so the velocity isn't too much higher than what you'll get.
The 62 TSX is the same profile as the 52-3 with a boat tail.
I would definitely favor the lighter TSX's out of your rifle.
The 70 grain TSX's are very long bullets and I would not try them in a 16" 223.
My 9 twist 16" AR shot the Hornady 75 grain BTHP's just fine.
I doubt a coyote could shrug one off but I've yet to shoot a deer with one so I won't recommend it.
The load is a fireforming load over Benchmark so the velocity isn't too much higher than what you'll get.
The 62 TSX is the same profile as the 52-3 with a boat tail.
I would definitely favor the lighter TSX's out of your rifle.
The 70 grain TSX's are very long bullets and I would not try them in a 16" 223.
My 9 twist 16" AR shot the Hornady 75 grain BTHP's just fine.
I doubt a coyote could shrug one off but I've yet to shoot a deer with one so I won't recommend it.
I can hit .6in @100 yards 5shot groups with 69gr SMK and 75gr Hornady BTHP. My 52gr SMK is about .488in. @ 100 yards. These are shot out of 1:9tw AR.
762willdo,
I want to know what these books are. Will these books go on to say that copper is more dense than lead? Will these books explain why a 75 grain VLD will stabilize out of my 9" twist at 2900 FPS but not at 2700 fps because of mysterious forces not attributed to RPM (which is the only other thing to change other than the 200 FPS increase)? Will these books tell me why Taildrag, ForneyRider and myself are having these dilusions of shooting bullets heavier than 70 grains out of 9" twist barrels and having it work well while keeping pressures lower and speed faster?
Assuming you've read these books, perhaps you can explain what was incorrect about my statement? You could also explain it to the one who wrote this: http://accurateshooter.wordpress.com/2008/06/03/calculating-bullet-rpm-spin-rates-and-stability/
Wayne
I want to know what these books are. Will these books go on to say that copper is more dense than lead? Will these books explain why a 75 grain VLD will stabilize out of my 9" twist at 2900 FPS but not at 2700 fps because of mysterious forces not attributed to RPM (which is the only other thing to change other than the 200 FPS increase)? Will these books tell me why Taildrag, ForneyRider and myself are having these dilusions of shooting bullets heavier than 70 grains out of 9" twist barrels and having it work well while keeping pressures lower and speed faster?
Assuming you've read these books, perhaps you can explain what was incorrect about my statement? You could also explain it to the one who wrote this: http://accurateshooter.wordpress.com/2008/06/03/calculating-bullet-rpm-spin-rates-and-stability/
Wayne
Not all 75gr bullets are the same.
75gr A-Max, 75gr VLD, and 75gr Scirrocco are longer than the 75gr Hornady BTHP and 77gr Sierra SMK.
I picked up some 73gr Berger's to try. Eventually, I will try the 77gr SMK.
The 69gr SMK is my 2nd best load I have, next to 52gr SMK, but only by a 1/10.
75gr A-Max, 75gr VLD, and 75gr Scirrocco are longer than the 75gr Hornady BTHP and 77gr Sierra SMK.
I picked up some 73gr Berger's to try. Eventually, I will try the 77gr SMK.
The 69gr SMK is my 2nd best load I have, next to 52gr SMK, but only by a 1/10.
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