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Rifles, Bullets, Barrels & Ballistics Applied Ballistics



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Unread 11-27-2007, 11:36 AM
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Join Date: Jan 2007
Location: MS
Posts: 1,652

I was thinking about building a fast twist 22 to shoot the 90 grainers. I have had great sucess with the 6x47 and 6.5x47 so the idea peaked my interest. I guess it would be similar to the 22/243 with just a tad less capacity, but I would get to use small primers which I like.

Anybody tried it?
Who makes the best fast twist .22 barrels?
Should I just go another direction like a 22BR or 22PPC or even straight 220 Russian?
Can anyone talk me out of having more rifles built?
I admit that I know just enough to be dangerous.....but dangerous at ever extending distances.
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Unread 11-27-2007, 12:40 PM
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Join Date: Dec 2006
Posts: 222
Can't talk you out of it. It is just right to do it.
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Unread 11-27-2007, 12:40 PM
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Join Date: Sep 2004
Location: on the rifle range in Utah
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Sounds like a fun little gun. But it probably won't outdo your 6x47L ballistically. The 22br fast twist would be another good one. I think Reed has got one and loves it. Maybe Varmint Hunter too? Can't remember.

I have a Shilen .22 8" twist that has sure been a good barrel.
Find it
Range it
Click it
Pull it
Dump it

If it's not far, it's boring.
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Unread 11-27-2007, 02:02 PM
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Join Date: Jan 2007
Location: MS
Posts: 1,652
Okay since no one even tried to talk me out it ...thanks.
It s time to get parts ordered. Shilen gets the nod for the barrel. I wishing I had gone out for the shilen yard sale now. I have access to a predator that will work, going with another robertson composit stock a little quicker than macmillan and IMO almost as good. Although when I talked with Shilen this morning they are 17 weeks out on savage replacements so time might matter if they are also that far behind on blanks. I will check and see.

Someone said I need a 7.5 twist? 8 or 7.5? Whats the heaviest .22s out there?
I admit that I know just enough to be dangerous.....but dangerous at ever extending distances.
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Unread 11-27-2007, 03:47 PM
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Join Date: Jan 2003
Location: Wallaroo, South Australia
Posts: 201
Personally I would choose either a 7.5 or 7.7 twist for use with the 90 grain bullets. An 8 twist might work ok with the shorter Sierra 90 grain MK (1.165 in) if they hold together, but some have found that it is insuffucient to get good accuracy with longer JLK (1.233) and Berger 90 grain bullets.

There has also been some debate on whether 6 or 8 groove barrels are kinder on the thin J4 jackets, but I havent yet used either to be able offer an opinion.

My .224 Clark has a Krieger 26 inch 6.5 twist, 4 groove barrel, and it is still work in progress. The 100 grain Wildcat ULD (1.300) and 105 grain Little HPBT (1.305) which were both built using J4 jackets, came apart at velocities above 2800 fps. The 80 grain Sierra MK came apart at about 3450 -3500fps.

Garry Little a local Oz custom bullet maker then made a variety of 85 - 110 grain bullets for me to try that were made on 257 and 277 cal jackets, and they all held together at maximum pressure velocities. However, they were made with a 6 cal ogive die, which was less than ideal.

Subsequently, Garry made some 10 ogive 100 grain HPBT's (1.250) using a 25 cal J4 jacket with a soldered core, and these have held together at velocities up to my maximum pressure load (56.0/H870) of 3,220. I am now testing to see what accuracy can be obtained with them at ranges out to at least 600 yards.

I believe that a 7.0 to 7.5 twist barrel would probably be sufficient to stabilise these bullets, so my 6.5 twist is adding to the stress on jackets. However, when I ordered the barrel I was expecting to be using the Wildcat 107 ULD which was 1.350 inches in length, but that didn't occur.

Hope that the above is of some help. Brian.
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Unread 11-27-2007, 03:57 PM
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Join Date: May 2003
Posts: 45

Sounds like enough overbore to erode the bbl out QUICK.
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Unread 11-28-2007, 05:09 PM
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Join Date: May 2006
Location: Southern Kalifornia
Posts: 24
A fellow shooter out her in Kali has done it. I have a fast twist barrel ready to d o it once my .20 x 47 Lapua eats the throat of the barrel. I have some info on it if your interested.
When I Die I Fear My Wife Will Sell My Gear For What I Told Her I Paid For It.
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