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What TWIST RATE for which bullet weight

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2009 at 17:18
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BULLET WEIGHT / CALIBER / TWIST RATE CHART

Grain/Cal .172 .204 .224 .243 .257 .264 .277 .284 .308 .338 .358
17-20 9-10                    
25 10                    
30 9 12                  
33   12                  
35   12                  
37 VLD 6                    
40   12                  
50-52   9 14                
55     12                
60     12                
68-69     9,10 13,14              
75     9   14            
80     8                
85     7 12 12 12          
90     7 10              
100       10 10   12 14      
105-107       8              
120         10 10   12 15,16    
130             10   14    
140           9 10 10      
150                 14    
140-160           8 10 10 12,13    
150-168               9 11,12,13    
150-180                 10,11,12    
160               9      
175               9      
180                 10,11,12    
200                 10,11 10,12 12,16
220                 10    
225                   10,12 12,16
240-250                 10 10 12
300                   10 12
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2009 at 17:56
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Good chart Wes, should be usefull to many.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2009 at 18:35
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Thanks, Wes.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2009 at 21:12
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What!  No 375!  Shocked
 
 
Just kidding, thanks
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/20/2009 at 07:31
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  Or 9.3?  Just funnin' to.  Got the chart in my FAVORITES already.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2009 at 13:20
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If I chamber a 1 in 16" twist 22 rimfire barrel in .223, the 55 gr bullets will not stabilize, but the 50 will, at least out to 100 yards.

We usually wind up using the 33 gr Vmax at 3500 fps is very good out to 180 yards.

That twist is off the chart.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2009 at 13:45
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Thanks Wes!!!  Excellent
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2009 at 16:13
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thanks

I was just looking for somthing like thatBig Grin 

matt
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2009 at 16:26
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Thunbs Up
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2009 at 16:28
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Question I have a 1:9 twist rate in my 223. Would I be better of shooting 68 gr. bullets as opposed to 50 or 55?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2009 at 19:04
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monster I was using the 50 gn v-max in the same barrel as you and it was shooting very good ouder a 1/2 IN but I found out that at 200 yard I had a hard time geting a 3 IN group also I had a very bad copper build up. I think that the twist was to much for the bullet . I will be going back to the larger bullets.  matt
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2009 at 19:28
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I shoot 55 grains out of my ARs with 1-9s all the time and they shoot good.  I have even shot 55s in the 1-7 and they do okay.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2009 at 22:03
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 I've shot bullets as light as 40 grains out of a 20", 1-9 .223. Sub-minute to maybe 300 yards (?) if the wind doesn't get ahold of them.
 It also handles 75 Hornady HPBTs very well, but NOT the 75 A-Max's!
They group lousy anywhere from the muzzle forward, but my cousin's 1-7 shoots them just  fine. I've never tried 77 or 80 Sierras in my 1-9,  but I wouldn't be surprised at rather dismal results with either. Most guys seem to need at least a 1-8 for those, at least in the .223.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/04/2009 at 15:31
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That is a very useful chart. Thanks.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/17/2009 at 10:06
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I'll throw in my .02 here as well and some of you really smart guys please correct me if I am wrong.. While we use bullet weight as a general guide it is really the length of the bullet that determines the twist rate required. All copper bullets such as the Barnes, Hornady GMX, and Nosler E-tip must be longer to achieve the same weight as a comparable lead core bullet and therefore one of these bullets that is equal in weight to a traditional bullet may not stabilize in a given twist rate. I have a 7mm RM that is a good example of this. The rifle has a 1-9 1/2 twist and will stabilize a traditional 145/150gr bullet just fine but will not stabilize a 150gr Barnes TSX. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/18/2009 at 00:09
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biggreen is right. it's more a function of length as wieght. i've got an excel spreadsheet that will tell you the optimum twist rate after you put in your bullet dimensions, but the problem is you can't easily alter your twist rate. This chart is about as good as anything I've seen. American Flag Very good ball park numbers I'd say.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/18/2009 at 21:05
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this chart is from dan lilja's web site i believe. i printed a copy out and keep it near my computer.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/28/2009 at 23:59
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Originally posted by Monster Monster wrote:

Question I have a 1:9 twist rate in my 223. Would I be better of shooting 68 gr. bullets as opposed to 50 or 55?

I shoot 55 Gr out of my 1/7 and 69gr out of my 1/9 and both hold sub moa at 100 and 1 moa at 300
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/21/2009 at 09:06
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it so un-uniform as to what gun likes what bullet best or what twist rate stabalized a 70gr best or what twist do I need to shoot a 168gr best.  The only way, and i repeat, only way to know what works best in your gun is to actually shoot it and test.  Example, i ordered two identical 24" barrels for myself and a friends AR to do an upper build.  Both put together by the same builder using the same headspace guages and mine puts the 75g A-max in the same dang hole almost at 100 yrds.  His can't get better than 1".  Even when I shoot both.  He can get best results from a sierrra 80gr where i get get anything them to group worth a crap.  So again. test and when you find a bullet weight that works keep plenty on hand because you know it works.  Then as you have time (and money) get some small boxes of other bullets and see if they compare.  A good method and what I have done in the past was load different gr bullets with a charge that would be safe for all and shoot them to 100yds.  whichever gr. bullet gave the best group I started to work the charge on until i got the best groups i could. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/16/2010 at 23:31
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i have a 9 in twist will it work with 77 gr sierra's?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/17/2010 at 01:49
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http://le.atk.com/pdf/223_MinimumTwistRates.pdf    Your best performance will be with bullets no longer than .829 inch with a 1:9 twist.   The 69 gr bullet is .900 I would suggest you measure the length of the 60 gr AMAX Horniday and try that fot the 1:9 twist.
 
You can shoot the 77 but it may not be as tight as it would with something in the 55 to 60 grain weight.   Try it and see what you get.  Note some 75 and heavier bullets have to be single shot loaded especially the 80 gr.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/17/2010 at 11:32
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Originally posted by cowski cowski wrote:

i have a 9 in twist will it work with 77 gr sierra's?
 Could go either way.
Shoot them to find out. It's the only way to know.
 You're on the borderline though, in my estimation.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/17/2010 at 14:30
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Originally posted by RONK RONK wrote:

Originally posted by cowski cowski wrote:

i have a 9 in twist will it work with 77 gr sierra's?
 Could go either way.
Shoot them to find out. It's the only way to know.
 You're on the borderline though, in my estimation.

77gr is a little heavy for 1 in 9 twist.  It might work well, but chances are you will do better with a lighter bullet.  My 1 in 9 twist 223 seems to really like 69gr SMKs.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/17/2010 at 14:40
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I would like to try some 77 gr. in my .223  1in8...does the military use sierra?  And I would assume it would have to have a cannalure, so is that set back far enough to allow a  crimp and still feed through a mag without single loading...I would imagine it would have to.  Any info you have would help I don't know anyone I could ask about the 77s locally.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/17/2010 at 15:45
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Originally posted by GetSome GetSome wrote:

I would like to try some 77 gr. in my .223  1in8...does the military use sierra?  And I would assume it would have to have a cannalure, so is that set back far enough to allow a  crimp and still feed through a mag without single loading...I would imagine it would have to.  Any info you have would help I don't know anyone I could ask about the 77s locally.

I am pretty sure there are two varieties of 77gr SMKs: with cannelure and without it.  I have only used the ones without cannelure, so I can't comment on the other ones.

ILya
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