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Shooting & Reloading - Mausers, Big Bores and others >> Mauser Discussion Forum
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JACKEL
.275 member


Reged: 12/01/10
Posts: 52
Loc: BUENOS AIRES, ARGENTINA
Caliber question and sugestions
      #155350 - 03/03/10 06:57 AM

I am having the chance to build ( with a local gunsmith ) a take down bolt action, I currently own a CZ 550 Medium in 9.3x62 and I also have a barreled action ( just the reciever and complete barrel in fact) from a Brno ZKK 601 in 308 Win,is it a good idea to use the 308 barrel and rechamber it to 30-06 Springfield ( no modification needed on the magazine box,bolt face nor feeding lips ), Since 9.3x62 ammo is really hard to come by here ( 120 US Dollars for a 20 round box of Sellier & Bellots ), the idea is to use the 30-06 barrel for general practice and when hunting Water Buffalo change to the 9.3x62 barrel. Any suggestions, or should I just buy a CZ 550 in 30-06 and leave the 9.3 as is.




Comments and suggestions welcome.


Cheers.


Ernesto.

Edited by JACKEL (03/03/10 07:01 AM)

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Tatume
.400 member


Reged: 09/06/07
Posts: 1091
Loc: Gloucester, Va USA
Re: Caliber question and sugestions [Re: JACKEL]
      #155363 - 03/03/10 12:08 PM

Dear Ernesto,

Why not build the Brno into a nice 308 Winchester rifle and use it for practice? The 308 is a very versatile and effective cartridge.

--------------------
Take care, Tom
NRA Life Member

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TilleyMan
.333 member


Reged: 23/08/05
Posts: 272
Loc: Melbourne, Australia
Re: Caliber question and sugestions [Re: JACKEL]
      #155368 - 03/03/10 12:45 PM

Ernesto

The Brno ZKK601 is a short length action and was chambered in .222, .223, .243, .308 amongst others.

The ZKK600 is the medium length action for 7x57mm, 7x64mm, .270, .30-06, 9,3x62mm etc.

You won't be able to rechamber a ZKK601 for the longer .30-06 or 9,3x62mm cartridge as it won't fit through the action. Also the magazine box and feed rails will need to have different profiles in order to present each cartridge correctly to the Mauser style extractor.

Have you fired the ZKK .308 to check accuracy?
You could have the gunsmith screw in the ZKK601 barrel one complete turn and rechamber it in .308 Win.
Post-'68 ZKK's have notoriously slack chambers and if the barrel is still in good condition rechambering will increase accuracy and lead to longer brass life.

I have a ZKK601 in .308 and it is a light and handy rifle chambered for a relatively powerful cartridge. Factory .308 ammo is pretty cheap and comes in a wide variety of bullet weights and types.

I'd leave the 9,3x62mm as-is and buy another CZ550 in your calibre of choice... much cheaper and better resale value if required later on.

Cheers

TM

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lancaster
.470 member


Reged: 06/05/08
Posts: 8753
Loc: There's a lighthouse in the mi...
Re: Caliber question and sugestions [Re: TilleyMan]
      #155401 - 03/03/10 05:46 PM

120$ for a box of S&B ammo is
I hope you get the reloading stuff for a better price. I would also go for the 308 win! ammo will be available everywhere and the cartridge will kill pigs and deers.

--------------------
Norwegian hunter misses moose, shoots man on toilet
.
bringing civilisation to the barbarians

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Tatume
.400 member


Reged: 09/06/07
Posts: 1091
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Re: Caliber question and sugestions [Re: lancaster]
      #155408 - 03/03/10 11:20 PM

I think the plan was to remove the barrel from the Brno action and install it on the CZ, rechambered to 30-06. There would probably be no issues with feeding 30-06 ammo through the 9.3x62 action. But, if it were me I would opt for building a 308 rifle on the Brno barreled action. Ernesto would only need a stock, and perhaps a trigger, safety, and magazine box. Even having a gunsmith assemble the rifle and bed the stock would be far less expensive and the investment would be much safer. It is certain to work, as compared to a switch-barrel, take-down rifle. He could probably do it himself.

--------------------
Take care, Tom
NRA Life Member

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450_366
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Reged: 17/01/07
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Loc: Sweden, west-coast.
Re: Caliber question and sugestions [Re: Tatume]
      #155409 - 03/03/10 11:21 PM

I think his lacking the bolt for the 308.

--------------------
Andreas

"Yeas it kicks like a mule he said, but always remember that its much worse standing on the other end"

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Tatume
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Reged: 09/06/07
Posts: 1091
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Re: Caliber question and sugestions [Re: 450_366]
      #155410 - 03/03/10 11:54 PM

Quote:

I think his lacking the bolt for the 308.



Ouch!

--------------------
Take care, Tom
NRA Life Member

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JACKEL
.275 member


Reged: 12/01/10
Posts: 52
Loc: BUENOS AIRES, ARGENTINA
Re: Caliber question and sugestions [Re: lancaster]
      #155411 - 03/03/10 11:56 PM

Thanks for the answers,I allready have a BRNO ZKK 601 in 308 WIN. in perfect condition. I was thinking of having build a TAKE DOWN with interchangeable barrels,and have the following components: complete barrel in cal 308 from another ZKK 601, and a complete rifle CZ 550 MEDIUM in 9.3x62, so the idea is rechamber the 308 to 30-06 add the forearm and locking latch for the take down mechanism, and the same with the 9.3x62 barrel, converting it to take down with forearm an latch, so I end up with one action and two barrels one in 30-06 and one in 9.3x62, with one action lenght (CZ 550 MEDIUM).
This would allow me to practice with one action lenght and same safety lever operation, since BRNOS safety levers work forward for safe and the CZ 550 works rearward fore safe, and bolt travel also is different from one action to another (short BRNO601, medium CZ550).
I am sorry but evidently I wasnt clear with what I wanted to do in my first post, I some times have difficulties with my english.


Best regards.



Ernesto.

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JACKEL
.275 member


Reged: 12/01/10
Posts: 52
Loc: BUENOS AIRES, ARGENTINA
Re: Caliber question and sugestions [Re: 450_366]
      #155412 - 04/03/10 12:00 AM

You are right 450-366, im dont have the bolt nor the trigger mechanism, I just have the stripped action with the barrel, the barrel is complete with rear sigt an front sight.


Best


Ernesto

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JACKEL
.275 member


Reged: 12/01/10
Posts: 52
Loc: BUENOS AIRES, ARGENTINA
Re: Caliber question and sugestions [Re: Tatume]
      #155414 - 04/03/10 12:06 AM

You are right Tatume, the plan is to use the 308 barrel and rechamber it to 30-06 and doing a take down , switch barrel rifle.




Best regards.



Ernesto.

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450_366
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Reged: 17/01/07
Posts: 1068
Loc: Sweden, west-coast.
Re: Caliber question and sugestions [Re: JACKEL]
      #155416 - 04/03/10 12:39 AM

If not a true take down, theres allways the switch barrel way. The same contur in the barrels and add a lug or similar under the chamber allowing you to have a custom spanner to unscrew one barrel and turn on another.

If i understand it right you wont use both when on hunting so theres no need for a second shaft or the take down mekanismen, you would have to have two scopes and check for zero everytime you change barrel anyway.

--------------------
Andreas

"Yeas it kicks like a mule he said, but always remember that its much worse standing on the other end"

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JACKEL
.275 member


Reged: 12/01/10
Posts: 52
Loc: BUENOS AIRES, ARGENTINA
Re: Caliber question and sugestions [Re: 450_366]
      #155417 - 04/03/10 01:03 AM

Exellent idea, I didnt knew something like that was posible, talking with the gunsmith about an hour ago ( its 11 AM here), about the cost of the latch mechanism on both barrels and forends it is going to be somewhere in 2000 US DOllars range, so your idea of just having switch barrels is very intresting as I believe cost would be much lower, do you have any pictures of how the switch barrels are assembled and the tools needed for it?


Best regards.


Ernesto.

P.D. I believe I should leave all this behind and go buy a CZ 550 in 30-06 and use it along with the 9.3x62 as ammo becomes available again ( last time I cheked with the importer 120 US Dollars for a 20 box of S&B in 9.3x62 and they had none in stock ), against 35 US Dollars for a box of 20 of Hornadys.

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450_366
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Reged: 17/01/07
Posts: 1068
Loc: Sweden, west-coast.
Re: Caliber question and sugestions [Re: JACKEL]
      #155422 - 04/03/10 01:38 AM

Sorry no pictures, but its basicly a action wrench and a wrench for the barrel/lug. The cost should be no more then chambering and setting the headspace together with soldering the lugs and rebluing the barrels. And the wrenches offcourse.

You take the action out of the stck, fitt the action wrench to the action and the barrel wrench to the barrel and turn the barrel off the action. Then you take the other barrel and turn it onto the action in a reverse manner and fitt the stock again, done. They are turned on tight but not as tight as an ordinary barrel, and the wrenches can be made so they are allign when the barrel is turnd in completly.

--------------------
Andreas

"Yeas it kicks like a mule he said, but always remember that its much worse standing on the other end"

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DarylS
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Reged: 10/08/05
Posts: 26535
Loc: Beautiful British Columbia, Ca...
Re: Caliber question and sugestions [Re: 450_366]
      #155428 - 04/03/10 04:01 AM

When screwing on a barrel, no more than 30 pounds torque is needed - this makes changing barrels easy.

I would leave the .308 barrel as-chambered. Iseriously doubt anyone is able to see the difference between the .308 and .30/06 on game. The .308 will probably chamber from the CZ magazine just fine. If it doesn't, THEN, it's time to think about a re-chamber.

The .30/06 case is not shaped the same as a 9.3x62 as the '06 has a LOT more taper. The 9.3x62 is very much closer to a .30/06Ackley Improved case. The .308's profile is much closer and is why it will probably chamber just fine.

Although I've seen some scematics on the 9.3x62 showing a .450" to .451" shoulder, 2 different 9.3x62 factory made and chambered rifles show a .454" shoulder, which is Ackley Standard for the improved '06 case.

Something no one has touched on, is that due to the fatter shoulder of the .308, it is probably not possible to re-chamber to '06 without the resulting chamber having a double shoulder. The first shoulder will be about .4" lower than the real one. The mid-case shoulder will be .455" and the '06 shoulder of .441" - quite a visual difference. This is another reason to consider the '06IMP chamber so the case's sides will be straight, without another step. Dies of course cost more.

The '06IMP will give enough of a boost to the '06 to make the chamber worthwhile, compared to a standard '06 and .308 comparrison.

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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