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22-250 twist rate

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  #15  
Unread 05-20-2012, 05:33 PM
Zep Zep is offline
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Re: 22-250 twist rate

Can you relate your experience with the .223?

Many thanks to all.
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  •   #16  
    Unread 05-20-2012, 08:13 PM
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    Re: 22-250 twist rate

    L= LENGTH OF BULLET IN INCHES
    D- BULLET DIAMETER
    T=RATE OF TWIST
    sambo {QUOTE}

    The orig. poster had a flawed formula in that it had no input for speed.

    The 1-12 twist 22-250 will shoot the 69's if the elevation and speed are high.

    But a slow speed .223 with a 1-12 won't shoot anything accurately 60 grains or higher, some 1-12's won't shoot the long 55 V-max.


    in a 223 only. I own each twist and speak from experience, not formulas.
    1-8 twist shoots 50-80's best is a 75 out to 600 yards.
    1-9 twist shoots 34-75's best is a 69 out to 600 yards.
    1-10 twist shoots 34-69's best is a 69 out to 600 yards.
    1-12 twist shoots 30-55's best is a 55 out to 400 yards.
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      #17  
    Unread 05-20-2012, 11:07 PM
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    Re: 22-250 twist rate

    What I would like to know is how am I stabilizing a 53gr vmax in my 22-250 with a 1 in 14 twist. It shouldn't work but it does. according to a twist rate calculator I would have to push it north of 4100fps. All I got is my gunsmith is really damned good, and my dies are make some very concentric loads, so everything lines up just so.
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      #18  
    Unread 05-21-2012, 08:10 AM
    Zep Zep is offline
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    Re: 22-250 twist rate

    Gamehog - I was wondering what powder you are using for 223.
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      #19  
    Unread 05-21-2012, 09:50 AM
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    Re: 22-250 twist rate

    Zep,

    The best powder I have found to work with 34's thru 80's is IMR 8208. With my 9 twist .223 I have a 3 shot 100 yard one hole group, in the 68-69 grain groups same rifle 1/2" at 200 yards. Lapua brass, cci450's, the brass is turned and the bullets are sorted by weight. When I shoot varmints I use lake City brass (unturned) and CCI450's, with 53 V-max, and 55's and I don't sort the bullets by weight.


    Best 200 yard loads:

    53 V-max
    CCI450
    25.6 IMR-8208
    Lapua brass
    2.260 col

    69 Nosler CC
    CCI450
    24.5 IMR-8208 * over max!
    Lapua brass
    2.260 col

    Joe King has a good point, sometimes it just works.
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      #20  
    Unread 05-21-2012, 10:52 AM
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    Re: 22-250 twist rate

    Quote:
    Originally Posted by A_Gamehog View Post
    Lots of misinformation here, by comparing the 223 and 22-250 with their twist rates. A 223 with a 10 twist shoots 69's a 22-250 with a 12 twist shoots 69's.

    For the 12 twist 22-250 you can shoot the 34 Grain dogtowns all the way up to the 69's. I know I own and shoot one.

    The most accurate is the long 60 grain V-max @ 3700+ fps.

    The 69's from a 22-250 must be shot at 4,000 elevation to work, as the twist is bordering stability.

    a 1:12 twist rate is good for roughly .30 B/C in the real world, and even then it's getting ragged. The Hornaday 53 Vmax is rated at .29 B/C, and really a 1:11 barrel would be better. I always work with a .85 factor number when figuring the thing out for a slight bit of cushion. The Sierra 1365 bullet is dead perfect for the 12 twist barrel, and my groups from three barrels seem to show this (mid twos for five shots if I'm lucky). I don't know what the B/C is for the Noslers, but it's gotta be in the .35 or higher range, and with that you need the 1:9 barrel minimum (maybe close to a .40B/C).

    a .223 bore barrel in any caliber is still a .223 bore with a certain rate of twist. The twist rate is what stablizes a bullet, and never the velocity or really even the rpm's at impact like we all thought thirty years back. A 1:14 twist 22-250 will not stabalize a bullet any better than a typical .223 in a barrel with the same rate os twist. Just the nature of the beast. It cost me a lot of hard earned money to learn this the hard way
    gary
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      #21  
    Unread 05-21-2012, 11:00 AM
    Zep Zep is offline
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    Re: 22-250 twist rate

    Gamedog - Many thanks. I was doing a lot of reading last night and I was wondering about Varget for .223 for a lite bullet, 34 grain Dogtown or a 40 or 50 grain Sierra. Gun is a 1-12 twist. Have you tried Varget here.

    I shoot all year and I like the idea of the no real temperature sensitivity with the Varget but as I am sure you are aware some of the upper loads can go compressed. I am not sure about compressed loads, I am not smart enough to start with that just yet.

    Also thinking of H322 as it appears to be less temperature sensitive than some other powders.
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