Speeding up the 224 heavies?

100percent

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Jun 5, 2019
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Rolling stone!
We always need a new toy, right?đź‘€
Debating a 224 caliber build to run 80-90gr bullets above 3300. Thinking but, not limited to Swift, 22/284 or 22 Cheetah with fast twist 24-26” barrel. There are some who say this is impossible due to constraints of caliber/bullet length/twist ratios. The contention is that if you get a twist suitable to stabilize the bullet length, it works against velocity (<3100) and/or bullet integrity will go to pieces due to hyper-twist above 3100.

I definitely see the logic of these constraints but, i have yet to find a guy who has actually experienced these limitations.

I know several of you guys have experience in this department? is it possible to accurately run the heavies above 3300? What say you?

Note: they make barrels everyday—-barrel life not a concern!!!
 
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zr600

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I have shot the 85.5 Bergers up to 3300. Only doing a latter test so I need to do some more work. I have also shot 75g amaxs at 3500 with great results. Trying the 85.5 to help with less wind drift. The 85.5s at 3300 will be almost 1/2 the wind drift as my 75g at 3500. I haven’t found pressure yet with the 85.5. I’m shooting the 85.5 in a 22-243 with a 26” barrel and rl26, the 75g amaxs are with h4831sc.
 

zr600

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Actually mines an 8twist. But I also have a blackhole weaponary barrel poly rifling they claim more velocity and a lot of times don’t need as fast of a twist, but I’m not so sure on that. My cousin shoots a 22-243ai he has shot 80geldm fireforming at like 3500, his fire formed load is with 77g tmk at 3600. That’s with a brux 1.8 twist barrel, he used h4831sc with the 80s, and rl23 with the 77s.
 

Gwine

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Mar 3, 2013
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Southern Oregon
In my 22” 8 twist creedmoor I got just over 3300 doing a ladder with 80eldm’s and H4350. Backed down to a conservative 3230 node. I would think that a 26” barrel would comfortably have you over 3300 with the 80 class bullets.
 

Varmint Hunter

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IMO, the best route is to go 22-243 (plain). It's a simple matter to get Lapua 243 brass and just run it through a 22-243 FL die. I was originally running a 22-243AI with 75gr A-Max moly bullets at 3,670 ft/sec. The accuracy was unbelievable. I've got a 600yd target around here somewhere with a .625" group on it.

I'm currently shooting a 22-243 (plain) just for convenience. I'm still using the same custom barrel but had the barrel set back 2" before rechambering. I'm running a Berger 82gr LR bullet at 3,450 ft/sec with RE23. Sub .5moa @ 400yds is common.
 

del2les

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Oct 24, 2007
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We've been doing this for sometime using the 22-250AI in 1/8 tw 26" and 7828SSC. No issues at all. One shooter uses a 220Swift-AI in 1/8 tw with RL26. We use chambers throated for the 75 and heavier bullets, so we can seat them out for added powder capacity.
 

Glenn Tullius

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Jun 28, 2019
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I have a fantastic shooting 220 Swift fast twist! Hart barrel on a Rem 700 action. This gun shoots 1/2 moa at 400 yards all day with the 80 grain Sierras. I have never even done any match brass, just factory shot 3-4 times! Full lenght resized and shot-period. I haven't even chrono'ed it, why?
 

del2les

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1607363764876.png


Here's one load with the 80gr AMAX

And here is the type of groups the 75-80's routinely shoot:
1607363858982.png
 

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