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#7239082 - 07/29/18 04:06 PM Iíve got an itch for a 22 CM
RedSnake Online   content
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Registered: 05/08/10
Posts: 3482
Loc: Dallas / Nolan County
I have a Tikka TAC A1 chassis and a spare SA tikka action that is taunting me. Thinking about doing a 22 CM to run the 95 gr SMK.

Will a 1:7 be enough or do I need 1:6.5?
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#7239105 - 07/29/18 04:40 PM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
FiremanJG Online   content
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Registered: 12/16/08
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"This bullet requires a barrel twist rate of 1x6.5Ē or faster."


https://www.sierrabullets.com/store/product.cfm/sn/1396/224-dia-95-gr-HPBT
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#7239108 - 07/29/18 04:46 PM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
duckhunter175 Online   content
Bird Dog

Registered: 04/15/17
Posts: 324
Loc: DFW
I went with 1:7 Bartlein in my 22-250ai. (not a bad choice for a fast twist .224 unless youre dead set on a 22cm)

On Berger's stability calc is shows 95gr SMK stable at 3100fps on 1:7 until you get down below 45 degrees temp at 500ft elevation. Since it is right on the border if you are set on the 95gr it would probably be best to err on the safe side with the faster twist 6.5".

I've got a pile of the 88gr ELDMs that I plan to run in my 1:7.



Edited by duckhunter175 (07/29/18 04:48 PM)

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#7239260 - 07/29/18 07:29 PM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
DStroud Offline
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Registered: 11/02/11
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Wonít really help much on your decision but I can say the 95 gr did not shoot well at all from my 1/8 twist 22 CM. It was stable enough to make nice clean round holes out to 350yards but 100yard groups were wild.
88 Ďs although have shot pretty well.
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#7239284 - 07/29/18 07:49 PM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
RedSnake Online   content
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I can order a 1:7 Hardy CF barrel (and comfortably run 88s or 90s) from dallasrifle at a good price or get a krieger 1:6.5 which is in stock.

Any idea on how short I can go on barrel length? Iíd like to do 24Ē or less.
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#7239302 - 07/29/18 08:11 PM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
FiremanJG Online   content
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Originally Posted By: RedSnake
I can order a 1:7 Hardy CF barrel (and comfortably run 88s or 90s) from dallasrifle at a good price or get a krieger 1:6.5 which is in stock.

Any idea on how short I can go on barrel length? Iíd like to do 24Ē or less.


24's burn up powder in 6mm and 6.5mm, why wouldn't they work in .22?
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#7239333 - 07/29/18 08:56 PM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
kmon1 Offline
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Registered: 09/27/06
Posts: 23410
Loc: Texas
The 22 will be more overbore. I would keep it 24 or longer if it were me. I think you will find Reloader 26 to be a good powder choice
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#7239337 - 07/29/18 08:58 PM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
DStroud Offline
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I run a 24 and going from memory based off what Derrick at Horizon is getting from his I would figure losing about 40fps per inch roughly. 22 caliber being smaller diameter than 6.5 will lose a little more per inch barrel length.
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#7239341 - 07/29/18 09:04 PM Re: Iíve got an itch for a 22 CM [Re: DStroud]
RedSnake Online   content
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Originally Posted By: DStroud
I run a 24 and going from memory based off what Derrick at Horizon is getting from his I would figure losing about 40fps per inch roughly. 22 caliber being smaller diameter than 6.5 will lose a little more per inch barrel length.


I was thinking 24", but I see a bunch of his are 20 or 22"
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#7239356 - 07/29/18 09:19 PM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
DStroud Offline
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Yes with everyone nowadays running Suppressed barrel lengths have gotten shorter.
One way to look at it is with a 20inch barreled 22 Creedmoor you can get the speed of a 24 inch barreled 22-250.
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#7239377 - 07/29/18 09:39 PM Re: Iíve got an itch for a 22 CM [Re: DStroud]
FiremanJG Online   content
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Originally Posted By: DStroud
Yes with everyone nowadays running Suppressed barrel lengths have gotten shorter.
One way to look at it is with a 20inch barreled 22 Creedmoor you can get the speed of a 24 inch barreled 22-250.


24" barrel +suppressor, .22-250 makes 75 gr go 3200 fps MV. Load it with 95's and it's still FAST.
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#7239390 - 07/29/18 09:55 PM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
RedSnake Online   content
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you know how i like to hotrod!


Edited by RedSnake (07/29/18 09:55 PM)
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#7239394 - 07/29/18 10:04 PM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
FiremanJG Online   content
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Originally Posted By: RedSnake
you know how i like to hotrod!


26" + can = a narrower powder charge node, but more speed. Get it hot, and it starts to shoot like chit...
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#7239410 - 07/29/18 10:37 PM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
dee Online   content
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Registered: 04/10/10
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Loc: Red River way
I'd be worried at 22 creed speeds running a 6.5 twist would over spin and shed jackets. My 7 twist will push 90gr at 3350 and it's generating crazy rpm.
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#7239730 - 07/30/18 10:31 AM Re: Iíve got an itch for a 22 CM [Re: RedSnake]
Txhillbilly Online   content
Tracker

Registered: 08/14/15
Posts: 626
Loc: Johnson County
I've got two 20 inch 1-7 twist Xcaliber 22 CM barrels setting on my table, just waiting for my Nucleus action to arrive.
I'll be shooting the 75gr AMax out of the first barrel since I have 1200 of them on the shelf, and probably won't go over 80-85 gr with the second barrel. If I want to shoot heavier bullets real fast I'll just grab the 25-06.

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