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View Full Version : heaviest .223 bullet for 1-12 twist


Pete1979
12-31-2011, 9:14 PM
Does anyone have experience with a 1-12 twist in a 223? I use the 52gr SMK and Hornady 52gr HPBT with great results but lately I've been wanting to try something heavier. Has anyone tried heavier bullets in that twist rate?

sargenv
12-31-2011, 10:14 PM
I think 55's are probably the heaviest bullets able to be stabilized by the 1 in 12.. but if you are willing to try a box of 60's, I would try them out for giggles..

ireload
01-01-2012, 2:53 AM
I have shot a 62 grain bullet (reload) from my single shot NEF rifle. I was getting roughly 1.75" to 2.00" from 100 yards. Considering the rifle was topped off with a 14x power scope. Now that 62 grain bullet was a Speer brand fmjbt similar to a M855. When I loaded some IMI 62 grain bullet the grouping opened to almost 3" at the same distance.

My NEF rifle is tuned for Sierra 52 and 55 grain pills. It's a general rule for the rifling twist and bullet weight. You can try heavier bullets and see the end result. At times it can be surprising.

AlliedArmory
01-01-2012, 3:38 AM
All barrels are different, but a 62gr will definitely be the highest I would try. Only your rifle will know what it can do.

FLIGHT762
01-01-2012, 6:42 AM
Sierra makes a 63 gr. SMP #1370 that was designed to stabilize in a 1-12" barrel and can shoot well in a 1-12".

Don Edmondson
01-01-2012, 6:59 AM
I have a Remington Model 700 in 223 with 1in12 I use Sierra#1380 69 gr HPBT Match King. there for 1/ 7to 1/10 twist but with my rifle they stay well under 1/2 " at 100 yds with 25 grains of W748 Try them Don
http://i719.photobucket.com/albums/ww200/clmntine/cal%20guns/223003.jpg

bruceflinch
01-01-2012, 8:09 AM
I'm having a :wheelchair: moment....:o

Remind me again.
1:7 twist is fast/slow?
1:12 twist is fast/slow?

The slower/faster the twist, the lighter/heavier the bullet?

Thank You for humoring a mature person. :p

grant22
01-01-2012, 9:21 AM
1-12 twist is slower than the 1-7. I think the OP's 53 gr SMK is about ideal for a 1-12 twist.

mnguyen84
01-01-2012, 10:33 AM
1:12" = 1 full rotation per 12".
..etc

Spanky8601
01-01-2012, 11:16 AM
A 52 grain Nosler out of my 700 will consistently shoot 5 shot groups of under 1/2 inch. I have tried a little heavier but the results have not been as good.

GeoffLinder
01-01-2012, 12:45 PM
1:12 is usually going to be limited to 55gr as heaviest that will "properly" stabilize but as said before, individual barrels often defy their specifications.

You might get a 60-62 to stabilize but I doubt you will have any luck with heavier.

As a case in point, the 1:9 twist is very common in AR's nowadays. A 1:9 is not supposed to stabilize 77gr bullets but sometimes a 1:9 barrel will, sometimes it won't.

Same situation here, you will just have to test to see what actually works in your barrel.

JagerDog
01-06-2012, 1:49 PM
Have to consider distance too. What works at 100 may not work at 200, 300, etc.

njineermike
01-12-2012, 8:18 PM
Is there any decent cross reference for twist vs. Bullet weight? I have some 55gr for my AR with a 1:7 teist, but I've been told that's too light.

GeoffLinder
01-12-2012, 8:46 PM
Is there any decent cross reference for twist vs. Bullet weight? I have some 55gr for my AR with a 1:7 teist, but I've been told that's too light.
55gr is just fine in 1:7 twist. 50gr or lighter may have problems, 52gr may or may not over-stabilize, but are usually good to go in 1:7 too.

Don Edmondson
01-13-2012, 9:55 AM
Is there any decent cross reference for twist vs. Bullet weight? I have some 55gr for my AR with a 1:7 teist, but I've been told that's too light.

http://i719.photobucket.com/albums/ww200/clmntine/Twistrateforbarrel.gif
Don

GeoffLinder
01-13-2012, 10:12 AM
http://i719.photobucket.com/albums/ww200/clmntine/Twistrateforbarrel.gif
Don

I disagree with that charts info on 1:7 twist barrels for the AR and so will many, many top grade NRA High Power competitors. 1:7 twist barrels are pretty much the standard for NRA High Power rifle competition. 1:7 properly stabilizes 68-80gr match bullets very, very well and works just fine with 55gr too. I have shot many thousands of rounds of 55gr factory and reloads through my AR with 1:7 barrel and accuracy is MOA or better out to 300+ yards (as far as I have tested 55gr in it). In fact, I use 55gr in it whenever I shoot 200 yard reduced range High Power matches.

Don Edmondson
01-13-2012, 10:45 AM
I disagree with that charts info on 1:7 twist barrels for the AR and so will many, many top grade NRA High Power competitors. 1:7 twist barrels are pretty much the standard for NRA High Power rifle competition. 1:7 properly stabilizes 68-80gr match bullets very, very well and works just fine with 55gr too. I have shot many thousands of rounds of 55gr factory and reloads through my AR with 1:7 barrel and accuracy is MOA or better out to 300+ yards (as far as I have tested 55gr in it). In fact, I use 55gr in it whenever I shoot 200 yard reduced range High Power matches.

Like you I use Match bullets they are better most 55 gr bullets are boat tail match are flat base. plus we slow them down most of the time. I shoot sierra 69 gr match in my ar 1in 9 most people say they won't work. but small groups in paper says they do also a lot of songdogs are one shot dead so the chart is what he asked for Don

GeoffLinder
01-13-2012, 11:49 AM
Like you I use Match bullets they are better most 55 gr bullets are boat tail match are flat base. plus we slow them down most of the time. I shoot sierra 69 gr match in my ar 1in 9 most people say they won't work. but small groups in paper says they do also a lot of songdogs are one shot dead so the chart is what he asked for Don

I have never before heard anyone say a 1:9 twist is not suitable for 69gr bullets. What I "do" hear said (and is a well known fact) about 1:9 barrels is they "usually" won't properly stabilize 75gr plus projectiles. Sometimes a 1:9 will shoot 75+ well, sometimes not, depending on the specific barrel. But any 1:9 is going to shoot 68-69gr fodder perfectly fine 100% of the time once you find a recipe that agrees with that barrel and it's specific accuracy nodes. If someone is having trouble with 68-69gr projectiles in a 1:9 twist barrel it isn't the twist rate that is their problem ;)

And BTW, the chart you posted is still not correct in regard to 1:7 twist barrels. Oly Arms has never been noted for the quality of their barrels, I trust what I hear from them "not at all" ;)

Californio
01-13-2012, 1:03 PM
My WIN M70 26" bull barrel 1x9 twist shoots 69 smk best but has no problem with Horn 75 bthp match bullets at 1 moa.