#2274301 - 06/25/08 08:50 AM
heaviest 223 with a 1-9
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BigDaddyK
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Registered: 05/13/08
Posts: 166
Loc: NE Texas
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Fast + Heavy
Slow + lite
A 1-9 is about average right? Or do I have it all wrong?
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#2274479 - 06/25/08 10:15 AM
Re: heaviest 223 with a 1-9
[Re: BigDaddyK]
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WGM
Campfire Outfitter
Registered: 01/20/05
Posts: 8278
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the longer the bullet, the faster a twist you'll need ...
traditional twist for a .223rem is 1:12" ... made for bullets up to about 50-55g ...
1:9" and the 69g SMK were made for each other ... but that same 1:9" twist is on the ragged edge for the 75g Amax at SAAMI .223rem speeds ... and the 75g Amax is the bullet you'll want to shoot, if going above 50g ...
So if you're building from scratch, go with a 1:8" twist and you can shoot anything from 40's to the 75g Amax ...
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-WGM-
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#2274574 - 06/25/08 11:07 AM
Re: heaviest 223 with a 1-9
[Re: WGM]
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Kay9Cop
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Registered: 03/30/07
Posts: 76
Loc: Salcha, AK
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I agree with WGM that the 69 SMK and 1:9 is a great match, but disagree partly with the 1:8 for shooting anything. With my 1:9, I've found that I don't get great accuracy shooting lighter bullets. I personally believe the bullet is over-stabilized, although some will argue that you can't over stabilize. I'm in the crowd that advocates choosing your twist rate to match the bullet you are most likely to shoot.
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#2274682 - 06/25/08 12:00 PM
Re: heaviest 223 with a 1-9
[Re: Kay9Cop]
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JPro
Campfire Guide
Registered: 12/13/04
Posts: 2650
Loc: Northern Louisiana
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I bought some bullets off a guy the other day who couldn't get stabilization from his 1-9" factory Remington 700. Those bullets were the 75gr A-Max, 75gr Berger VLD, and the 80gr Sierra Matchking. My barrel is a 1-8", so I should be good. Finally got an action for my rig, now just to get it all assembled!
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Menace to Society (In other words, a Conservative Republican)
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#2274767 - 06/25/08 12:45 PM
Re: heaviest 223 with a 1-9
[Re: JPro]
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tikkanut
Campfire Regular
Registered: 01/30/01
Posts: 979
Loc: Utah
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Factory 9 twist Savage takes 75 A max just fine...69 SMK..55 NBT too...
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#2274801 - 06/25/08 01:03 PM
Re: heaviest 223 with a 1-9
[Re: tikkanut]
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Lee24
Campfire Guide
Registered: 04/11/05
Posts: 4890
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My Bushmaster AR-15 with 1:9 shoots everything from 50 to 69 grains very well.
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#2274949 - 06/25/08 02:26 PM
Re: heaviest 223 with a 1-9
[Re: Lee24]
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RickyD
Campfire 'Bwana
Registered: 07/07/04
Posts: 12180
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I have a Colt AR with a 24" 1:9 twist that will shoot 35 to 69 grain bullets good. I've tried 70 grain TSX's in it with just OK (1.5") results.
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#2275459 - 06/25/08 06:54 PM
Re: heaviest 223 with a 1-9
[Re: tikkanut]
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devnull
Campfire Regular
Registered: 12/21/05
Posts: 270
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My Stevens 200 with a 1/9 will not run a 75 AMAX with any accuracy...Shotguns patterns. AMAXes tried with Varget and Benchmark. Neither worked well.
Factory 9 twist Savage takes 75 A max just fine...69 SMK..55 NBT too...
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#2290142 - 07/03/08 12:07 PM
Re: heaviest 223 with a 1-9
[Re: devnull]
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Fast_Ed
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Registered: 04/27/04
Posts: 234
Loc: SE Wisconsin
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A 1-9 is on the edge for the 75's from anybody. A 20" AR barrel may not stabilize them, while a 24" bolt barrel might, just because of the difference in velocity the extra 4" gives you. A higher velocity with the same barrel twist rate will result in a faster rotation, giving better stabilization to longer bullets. That's why WGM's "fast" barrel may stabilize a 75, but Joe Blow's "slow" barrel might not. A 1-9 is on the ragged edge and only specific testing on that barrel will tell if it will stabillize a 75. I have 5 AR's with twist rates from 1-7.75 to 1-12 depending on what I will shoot out of them. If you can, get another upper with a different twist when the target changes requiring a different bullet. That's one of the beauties of the AR platform.
Fast Ed
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Define your manhood not by success, but by significance.
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#2290691 - 07/03/08 05:47 PM
Re: heaviest 223 with a 1-9
[Re: Fast_Ed]
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Seafire
Campfire Ranger
Registered: 04/20/04
Posts: 1566
Loc: Southern Oregon USA
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Well with a factory Savage 12 BVSS with a one in 9, that rifle will shoot any 80 grain bullet or 75 grain just as accurate as one could desire..
I run my loads in the 2700 to 2900 fps range depending on powder and charge...but I've had NO Stability problems EVER! granted it only has about 2000 rounds down the barrel...
a one in 8 twist barrel or a one in 7 twist barrel will shoot all of those weights...even in 223...
If your bolt action rifles are shooting them accurately, I'd look at your loads, before I'd blame the barrel twist...
my Savage will shoot an 80 grain A max just as accurately as it will a 55 grain V Max...except when the distance is greater, then the 80 grainers leave the 55 grainers in the dust...
_________________________
A reporter did a human-interest piece on the Texas Rangers. The reporter recognized the Colt Model 1911 the Ranger was carrying and asked him "Why do you carry a 45?" The Ranger responded, "Because they don't make a 46."
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#2291649 - 07/04/08 08:04 AM
Re: heaviest 223 with a 1-9
[Re: BigDaddyK]
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Ringman
Campfire Guide
Registered: 11/03/03
Posts: 3156
Loc: Grants Pass, OR (541) 479-4646
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BigDaddyK,
I used to shoot the 80 Sierras from my 9 twist Savage .223 out to 700 yards. Then I discovered the rifle prefered the 75 A-Maxes. In fact my longest 'chuck was with the A-Max: 527 yards. Entered the rump and exited the chest as it was grazing away. I shot only one group with the A-Maxes at 724 yards. It was six shot in a five inch group.
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If we walk in the Light as He is in the Light we have fellowship.
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#2293199 - 07/05/08 07:05 AM
Re: heaviest 223 with a 1-9
[Re: GSSP]
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BigDaddyK
Member
Registered: 05/13/08
Posts: 166
Loc: NE Texas
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We, me, my youngest son will be shooting 150 max. east texas whitetail.
Found some handloads from KC Precision ammo at the last gunshow. 70 gn Sieras with a bullistic tip. The guy ran out but I may order some.
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