243 ackley twist rate

[243DH]

Hey guys got a few questions, would a 1-9 twist 243 ai stabilize 105 hybrids and vld? I have had several 243 1-8 and a 243 ai 1-8 and all were fine, but now i need to replace a remage barrel and in a quandary. I can get a 26" varmint in 1-9 or a 28" bull 1-8. If i go the bull route i will have cut down to 24" and recrowned m40a3 style. The current rifle is a 24" bull, 243 win, that i did this way. I don't mind 26" and prefer varmint contour, but not sure if a 9 twist would work. I know some guys can get some 105s to stabilize in factory 9 1/8 twist. Should be able to get 3100 easy with 26" 243ai and 105 bullets, think it would stabilize or am i better off just getting the 8 twist?

 

[LCazador]

That all depends on what accuracy you expect and how long the 105gr bullets are. It isn't the weight of the bullet but how long it is. IMHO go with 8 twist!

 

[MrMajestic]

http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi

 

[13red56]

I have 2-243Ack one is a Shilen 8 twist the other is a factory sendero barrel with a 9-1/4 twist. Now the 8 twist will stabilize a 115 Berger good enough to hunt with and shoot every 105-107gr bullet I've shot very well. The 9-1/4 shoot the 95 Bergers great and the 105 marginal and since it shoots the 95 great I didn't even try the 105's anymore. Personally I would go with an 8 just so I wouldnt have to wonder.

 

[Firearmsunlimited]

Hey guys got a few questions, would a 1-9 twist 243 ai stabilize 105 hybrids and vld? I have had several 243 1-8 and a 243 ai 1-8 and all were fine, but now i need to replace a remage barrel and in a quandary. I can get a 26" varmint in 1-9 or a 28" bull 1-8. If i go the bull route i will have cut down to 24" and recrowned m40a3 style. The current rifle is a 24" bull, 243 win, that i did this way. I don't mind 26" and prefer varmint contour, but not sure if a 9 twist would work. I know some guys can get some 105s to stabilize in factory 9 1/8 twist. Should be able to get 3100 easy with 26" 243ai and 105 bullets, think it would stabilize or am i better off just getting the 8 twist?

According to Berger's program 1 in 7 1/2 is about as fast a rate as use can use for those bullets.

 

[Bill Norris]

I went with a 1 - 7.5 Twist in order to stabilize the 115 gr. Seems to work well so far but I only tried the Nosler RDF 115 so far.

 

[284winner]

Hey guys got a few questions, would a 1-9 twist 243 ai stabilize 105 hybrids and vld? I have had several 243 1-8 and a 243 ai 1-8 and all were fine, but now i need to replace a remage barrel and in a quandary. I can get a 26" varmint in 1-9 or a 28" bull 1-8. If i go the bull route i will have cut down to 24" and recrowned m40a3 style. The current rifle is a 24" bull, 243 win, that i did this way. I don't mind 26" and prefer varmint contour, but not sure if a 9 twist would work. I know some guys can get some 105s to stabilize in factory 9 1/8 twist. Should be able to get 3100 easy with 26" 243ai and 105 bullets, think it would stabilize or am i better off just getting the 8 twist?

If your shooting in Illinois, no it won't stabilize the 105s real well. At 4000 and above, you'll be ok. I'm at 1000'asl and my 9 twist won't quite shoot the 105s consistently well. I'd go with an 8 twist for 115 grain bullets or lighter.

 

[Bugs]

I have a 9 twist (Hart barrel) .243 AI and it is really marginal with any 105 class bullet.

 

[NZ_Fclass]

Not sure what a 9 twist is for? Go 7.5 or 8 minimum. I have a 7.5 Criterion- shoots very well. Don't they offer some prefits?

 

[tiny68]

I have 6mm Rem AI that is pretty much an equivalent to a 243 W AI. When I built it, my gunsmith told me to go with the 1:9 so we did.. It shoots the 105-107s exceptional well. A lot of people have told me I need a minimum 8" twist. I don't know if the extra 50-100s fps from a 6mm Rem AI makes that much of a difference or not. luck, Tim

 

[1shot]

I have an 8 T. It shoots 105 Hornady Bal. tip great.

Lloyd

 

[scope eye]

I have a 6-06AI, 6WSM, 6MachIV, as well as a 6RUM in 14 twist and they all shoot up to 105s no problem, I do have to send them at least 4000fps to stabilize, this out to 300- 400 yards maybe 500 further than that I don't know I have never tried. My 243AI 12 twist will shoot 90gr no problem.

Dean

 

[243DH]

Holy necro threads batman, lol. Just a 7yr update, went with an 8tw varmint, burned it down a 5yrs ago, sold action and just run accuracy international and badger actions.

 

[Kurz]

243DH,

Thanks for tagging back in even though you started the thread a while ago. Not everyone pays attention to the follow up but I know I enjoy reading about the ending you found.

 

[284winner]

Holy necro threads batman, lol. Just a 7yr update, went with an 8tw varmint, burned it down a 5yrs ago, sold action and just run accuracy international and badger actions.

Hahaha. Never even looked at the age of the thread. Glad you came back for the update.

 

[johnfred1965]

this one came back to life just in time, I need a new barrel on my .243W. I had figured on a 1/8 but it is nice to have confirmation.