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CZ 550 9.3X62 twist rate
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Picture of Dave Bush
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The CZ web site says that their 9.3X62 barrel has a 1:10 twist rate. I was wondering if anyone has ever confirmed that? Usual twist rate for a 9.3X62 is 1:14. The barrel on my Blase 9.3X62 has a 1:14 twist.


Dave
DRSS
Chapuis 9.3X74
Chapuis "Jungle" .375 FL
Krieghoff 500/.416 NE
Krieghoff 500 NE

"Git as close as y can laddie an then git ten yards closer"

"If the biggest, baddest animals on the planet are on the menu, and you'd rather pay a taxidermist than a mortician, consider the 500 NE as the last word in life insurance." Hornady Handbook of Cartridge Reloading (8th Edition).
 
Posts: 3728 | Location: Midwest | Registered: 26 November 2006Reply With Quote
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Dave,
I have a older CZ550FS that I imported from the states about 4 years ago and the twist is around 1:14"(measured)...
About that same time I read that CZ went to a 1:10 twist rate..
I am happy with the 1:14" as the slower twist is a little better/easier on cast bullets which I shoot exclusively..
 
Posts: 592 | Registered: 28 February 2005Reply With Quote
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Picture of Kabluewy
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It's been my belief that the CZ site is wrong. I can't explain it. However all the factory CZ barrels I've measured were 14" twist.

I would call CZ USA, and ask.

KB


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Posts: 12818 | Registered: 16 February 2006Reply With Quote
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My 9.3 550 FS has a 1:14" twist, measured. I beleive the CZ claim of a 10" twist is in error.
The 1:14 twist seems to be sufficient for bullets up to at least 320 gr.
 
Posts: 317 | Location: Texas Panhandle | Registered: 09 July 2006Reply With Quote
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My 550 Hogback IS 1/10"
 
Posts: 538 | Location: North of LA, Peoples Rep. of Calif | Registered: 27 November 2004Reply With Quote
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Guys, I sent off a note to Jason Morton at CZ and here is the response I got about the twist rate in the CZ 550 9.3X62:

"Dave,

My latest specs show 1:14" for the twist. I used the
9.3 on black bear last week and had great performance using the new
Federal 286 grain Swift A-Frame load (it should be out on the market in
the next couple of months)

Thanks for the heads up on this. I'll make sure the spec gets corrected
on the website and I apologize for the confusion.



Jason Morton"

Pretty good news on the new 286 grain Swift too!


Dave
DRSS
Chapuis 9.3X74
Chapuis "Jungle" .375 FL
Krieghoff 500/.416 NE
Krieghoff 500 NE

"Git as close as y can laddie an then git ten yards closer"

"If the biggest, baddest animals on the planet are on the menu, and you'd rather pay a taxidermist than a mortician, consider the 500 NE as the last word in life insurance." Hornady Handbook of Cartridge Reloading (8th Edition).
 
Posts: 3728 | Location: Midwest | Registered: 26 November 2006Reply With Quote
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Some pundits of the fast-twist school rejoiced in the apparent faster twist of the 9,3x62, only to find out that it was an error on CZ's website.

Finally we have a correction.

Warrior
 
Posts: 2273 | Location: South of the Zambezi | Registered: 31 January 2007Reply With Quote
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Once again, Dave separates the rumors from the hard facts! Kind of like that guy I read about once that parted the Red Sea!!!
 
Posts: 20170 | Location: Very NW NJ up in the Mountains | Registered: 14 June 2009Reply With Quote
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quote:
Once again, Dave separates the rumors from the hard facts! Kind of like that guy I read about once that parted the Red Sea!!!


'Er, the Sea of Reeds...

LD


 
Posts: 7158 | Location: Snake River | Registered: 02 February 2004Reply With Quote
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Picture of Kabluewy
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The reason I knew the twist was 14" is because I tested it on actual barrels, and that was because I was argued with by those who had it in their minds that the twist was actually 10", wich was nothing more than a belief. Even after showing them, some still believed it was 10". It bacame an issue of contention for me, so I checked every CZ 9.3x62 barrel I could, and they were all 14". I even called CZ and tole them, but still they didn't change their web site info. It didn't make sense for CZ to make that barrel in 10", because CIP specs are 14".

Anyway, it's sorted out now.

KB


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Posts: 12818 | Registered: 16 February 2006Reply With Quote
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