Barrel Twist for .224" 90gr

[257Roberts]

For fast 22 cals, say a Valkyrie, 22-250, 22 Nosler etc. what barrel twist would you use for the 90gr bullets?

Valkyrie is what, 2600 from a 24", Nosler might be 2700. If barrel length was 28-30 [match rifle], you might get 100fps more?

Is 1:7 enough? I know in a 223 Rem it is not. Really need 1:6.5.
But at say 2750-2800 fps, i worry about blowing up bullets.

Thoughts? Suggestions?

Thank you.

 

[urbanrifleman]

7 twist up to 3100 fps. 300k terminal spin is right at 3000 fps.

My 7 twist shoots the ever loving crap out of 88s and '90s. I've shot 7 twist from 2650 in 223 all the way to 3050 in my 22bra.

2850 is ideal fps for 7 twist. I've never heard anybody say that you have to have a 6.5 to shoot 90s in a 223. I'm pretty sure that John Whidden said that the 7 and the 6.5 shot about the same with the Berger.

 

[urbanrifleman]

Terminal spin for 6.5 is at 2750.

 

[Jeff Porter]

Shooting 90’s in a .223 REM 7 twist with good results at 2800 fps.

 

[Shurefire]

My 7 twist 22 Creedmoor hasn’t had issues with the 90’s, but the 95’s it has had some issues. My next barrel will be 1-7.5 or 1-8. I have to run the 95’s at about 2800 or slower to ensure they all register on the e target. Or it could be the etarget?…….

 

[LVLAaron]

6.8


Will service 90 and 95s. That’s what the best 223 FTR shooter I know uses.

 

[Precisionhunter417]

1:7.0 x 26” 223 Rem ISSF reamer barrel shoots Berger VLD and sierra SMK 90s at 2730-2750 and hots great groups.

 

[Mudcat]

7 twist is all you need in the 223Rem....at least in our long bbl'd Palma rifles

 

[jpjulian]

I had a 26" PacNor 7.5 twist in an AR spacegun I was using for Highpower. I played with Sierra 90's for awhile but with the powder I was using at the time the pressures were obscene. Accuracy was ok but scary pressures. No idea the velocity but it just wasn't worth the effort over the 80SMK's. The 90's poi were roughly 18" below the 80 at 600.

 

[urbanrifleman]

I had a 26" PacNor 7.5 twist in an AR spacegun I was using for Highpower. I played with Sierra 90's for awhile but with the powder I was using at the time the pressures were obscene. Accuracy was ok but scary pressures. No idea the velocity but it just wasn't worth the effort over the 80SMK's. The 90's poi were roughly 18" below the 80 at 600.

I know a real famous across the course rifle designer that said the same thing. People in his area just shoot the 80 ELDM.

 

[urbanrifleman]

Most important thing to make the 90s work in the 223 is to get the freebore right. I'm going to assume most people are throated too short.

 

[padom]

26" Valkyrie bolt gun with 88-90's maxed out around 2850 before trashing brass quickly with a 224V long freebore reamer specifically for 88/90's in a bolt gun...

Faster 22's like 22BR and 22GT i have found 1-7.5 to be optimal across numerous barrels. Much more consistent accuracy and no erratic unexplained flyers.

 

[Rocketvapor]

Wow, trashing brass, one and done like trashing?

22 Nosler 26" 7 twist, SB6.5, one Savage bolt gun, one is an AR.
85.5 Keep it to 3000 or a little less,
90 A-tip Same, 3000 or a little less
95 2900 seems good.
Not trashing brass.

 

[padom]

Wow, trashing brass, one and done like trashing?

22 Nosler 26" 7 twist, SB6.5, one Savage bolt gun, one is an AR.
85.5 Keep it to 3000 or a little less,
90 A-tip Same, 3000 or a little less
95 2900 seems good.
Not trashing brass.

Yes anything over 2850 was 1 and done with 90smk. Super loose pockets. Had to keep under 2850 to avoid that...

This was a while ago with Starline brass.

Vs my 220TB 12+ firings shooting 90s @ 3000 out of same length barrel.

224 Valkyrie Bolt Gun Testing/Review

With a lot of guys interested in 224V out of a bolt gun, I decided to do some testing. The current reamers out there for AR's have you hitting the lands with 88 ELD-M's around 2.33-2.34... That still has a good bit of bearing surface down in the case below the shoulder/neck junction. I...

www.snipershide.com

224 Valkyrie vs 220 Thunderbolt

224 Valkyrie vs 220 Thunderbolt Valkyrie on the right is at max charge, compressed and heavy bolt lift at 2900 and trashing brass. Cartridge on left should do 3000 easy with 4-5gr more powder capacity but we will see. Bighorn Origin 6.8 Bolt Head Bighorn 12 point nut MDT ACC Jewell MDT BR...

www.snipershide.com

 

[Maximus1840]

22CM, 1:7, 26" PVA .219 bore. I shoot 90 grain SMK's @ 3200 FPS and 95 SMK's @ 3100 FPS and have not had any puffers to date after 550 rounds. I have only shot them at 100yrds though.

 

[SBS]

.22 BR using 90 Sierra on Krieger 7 Twist, 28" long, 3000 fps, no problem @ 600.

 

[1911mag]

For fast 22 cals, say a Valkyrie, 22-250, 22 Nosler etc. what barrel twist would you use for the 90gr bullets?

Valkyrie is what, 2600 from a 24", Nosler might be 2700. If barrel length was 28-30 [match rifle], you might get 100fps more?

Is 1:7 enough? I know in a 223 Rem it is not. Really need 1:6.5.
But at say 2750-2800 fps, i worry about blowing up bullets.

Thoughts? Suggestions?

Thank you.

1:7 works for .223 all day long, Berger 90’s with ISSF reamer

A lot info on site and people help with questions.