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Author Topic: 220 AI vs 22/6mm  (Read 857 times)

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Offline Silvertp

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220 AI vs 22/6mm
« on: October 28, 2009, 07:01:24 AM »

Ive got a long action rem. 700 blueprinted and a 30" #6 Pac Nor bbl, 1 in 7" twist currently chambered in 22/284.

Im not haveing much success finding loading data for the 22/284, and my load development hasn't given me acceptable results so far.   Was thinking about converting to a 220AI or 22/6mm.

Is this do-able?  Can the chamber end of the bbl be shortened and rethreaded?  Would both of these rounds require modifications to the bolt and how about feeding?

Which of the above rounds would provide the most out and out horsepower for a 22 caliber?

Appreciate your comments.

Silvertp

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Offline Wyo. Coyote Hunter

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Re: 220 AI vs 22/6mm
« Reply #1 on: October 28, 2009, 08:13:33 AM »
 ;) Silvertip,  I have a swift on the 700 action. It works fine, but I am not sure the long action would feed correctly. We put a .22-250 on a left hand long action for a pal years ago. It would not feed from the magazine with more than one round in the mag. He MAY have corrected it, but 10 years ago he had not.
So I am wondering about the Swift even the AI in that action.  :-\ I have a .22-250 AI with a quick twist, but have not done alot of shooting  with it at the present. I know I had data from Serria for it I believe. One source for some good info. Would be the Serria Hot Line, if you do not have it, 800 -223-8799.. I usually talk with Paul Box, he has several quick twist .22 calib. rifles, and may have an Improved Swift....  ;D Hope this helps.... ;)
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Offline wackmaster

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Re: 220 AI vs 22/6mm
« Reply #2 on: October 29, 2009, 02:06:18 AM »
I have a 22-6mm imp. The load dev. for this rifle was vary frustrating I could olny find one load that gave the vol. I wonted with good accuracy.
56.0 gr 7828ssc fed match primers win. brass hornady 55gr v-max moly. 4286fps. This case and the 22-284  are way over borred so you need slow powders.
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Offline billy_56081

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Re: 220 AI vs 22/6mm
« Reply #3 on: October 29, 2009, 02:29:49 AM »
Look into the 224 TTH basically a 6mm 22 imp.
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Offline jedman

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Re: 220 AI vs 22/6mm
« Reply #4 on: October 29, 2009, 05:23:10 AM »
  Silvertp,   I beleive you have the basis for the most horsepower now with the 22-284.
If you beleive all was done properly in that rifle, chambering & headspace, crown, bedding ect. I would keep at it to find the right load for it.  30"  barrel   ??? that might make it real fussy.  Good Luck
    Jedman
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Offline Catfish

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Re: 220 AI vs 22/6mm
« Reply #5 on: October 30, 2009, 03:47:41 PM »
If you can not get that barrel to shoot in .22-284 what makes you think it would shoot in a different chamber? What weight BUllets are you shooting? With a 7 twist you should be useing 80 or 90 gr. bullets.
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Offline Silvertp

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Re: 220 AI vs 22/6mm
« Reply #6 on: November 03, 2009, 03:09:27 PM »
Howdy folks and thanks for your input.  Ive decided that I have the caliber I want now.  I guess I was thinking that there was more loading info available for the swift AI and 22/6mm and that would make finding a few good loads less of a needle in a haystack effort. 

I should have known that load development on a wildcat like the 22/284 could take some time.   Im confident in the smith that put this together for me and just need to suck it up and keep trying some different combinations of bullet / powder.  There are lots of heavy for caliber .22 bullets available and slow powders that I haven't tried.

I did contact several of the bullet manufacturers and got some good advice on bullets and loads.  Think Ive got enough starting points now that I can make this happen.  I'll either find a load or burn out the bbl trying.  Hopefully not the latter  ;)

Silvertp
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