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223 Ackley Improved

 
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  #1  
Old 02-06-2011, 05:35 PM
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223 Ackley Improved

Anyone have any experience with this round. I am looking at rebarreling to this caliber and am not sure if a guy really needs a 26" barrel to get 3000-3100 fps with the Hornady 75 amax. Am looking at a 8-twist possibley 22" long to mid - long range practicing and varminting. Thanks a bunch.
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Old 02-07-2011, 05:18 PM
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Re: 223 Ackley Improved

Sounds a bit optimistic to me, since the "improvement" in the 223 isn't all that great. You're already dealing with a case with fairly minimal body taper and a reasonably sharp shoulder. In 223 match rifles, 2,750 with the 77s is already moving pretty good and flirting with pressures. I ran this one (223 AI) out on Quickload with both a 22" and 26" barrel, and went from 2,800, on up to about 2,900 fps. That was with the cyber-pressures running at absolute max, and I doubt I'd be pushing a real rifle quite that hard. Especially when it was my face behind the bolt, if you get my drift.

If you want 3,000-3,100 fps out of the 75s, I'd say a bigger case is in order, not just a longer barrel.
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Old 02-07-2011, 09:19 PM
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Re: 223 Ackley Improved

I couldn’t tell you if the FPS is possible with that bullet/twist combo etc.. But what I do Know is that Quickload is NOT the end all be all when it comes to load development just a GOOD starting point. I shoot a .223 AI with a tight chamber and a 24” krieger 1:14. I can push a 50gr Blitz King with 28.3gr (pet load) of XBR or 28.5gr of X-Terminator, LC & rem 7 1/2 over 3700 FPS which Quickloads will dismiss along with some other people. I do this all day long with no pressure signs and get about 4-6reloads out of the brass. Every rifle is different, start low and work your way up. I am very impressed with this round in my rifle and happy I did it.


01/15/2011, 50 degree's. 28.3gr XBR



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Old 02-08-2011, 10:16 AM
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Re: 223 Ackley Improved

Never said QL was anything other than a useful tool, and this is one of those examples. However, the question pertained to 75 grain bullets. Having fired a few 77s and 80s over the years, I can assure you, it's going to be hard to hit that 3,100 fps figure without fire-walling the load, and then some.

In the meantime, if you don't think 3,700 fps is a pressure sign, more power to you.
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Old 02-08-2011, 06:44 PM
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Re: 223 Ackley Improved

Thanks guys, I might be asking to much from such a little case. I just figured it would be a good economical round using only 25-27grains of powder with hardly any recoil while still having a bullet capable of being supersonic to 1000yds. Barrel life hopefully 5000 rounds?
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Old 02-08-2011, 07:09 PM
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Re: 223 Ackley Improved

Quote:
Originally Posted by Jayhawk View Post
Thanks guys, I might be asking to much from such a little case. I just figured it would be a good economical round using only 25-27grains of powder with hardly any recoil while still having a bullet capable of being supersonic to 1000yds. Barrel life hopefully 5000 rounds?
I would agree that a 1000 yards is pushing it, may want to think about a PPC or BR. My smith has a reamer for a 22x47 that he is working up loads for now. He plans on the 80’s -90gr’ers. Good luck!
FYI… reloadersnest.com has a couple of 75gr’s getting 2998 FPS w/ a .223 AI.
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Old 02-09-2011, 10:21 AM
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Re: 223 Ackley Improved

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Originally Posted by Jayhawk View Post
. . .while still having a bullet capable of being supersonic to 1000yds. Barrel life hopefully 5000 rounds?

Jayhawk,
You've got the twist to handle it, so why not take a look at the 80 grain offerings like the Bergers? They'll stay supersonic at 1,000 with the speeds that are realisitcally possible (say, 2,800- 2,850 fps) with a 223 AI. I have some doubts about the 75, since it's considerably less streamlined than the VLDs. Remember, as German Salazaar always says, velocity's temporary, but BC lasts forever.

A barrel life of 5,000 rounds is possible, but probably a bit optimistic. Hard to say here, since it means different things to different people. For a hunting gun, I'd say it'll likely make it, especially if the heavy weight bullets aren't the only thing that goes downrange. For a competitive shooter, not so likely. really depends on what you consider to be "shot out".
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