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Shooting & Reloading - Mausers, Big Bores and others >> Mauser Discussion Forum
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Rule303
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Reged: 05/07/09
Posts: 5063
Loc: Woodford Qld
Re: Brno ZKK 600 9,3x62mm Project [Re: Ben]
      #212767 - 15/07/12 11:51 PM

Well done TM. Verygood job on the stock and refinnishing the rifle.

Now to go shoot something with it.

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DarylS
.700 member


Reged: 10/08/05
Posts: 27006
Loc: Beautiful British Columbia, Ca...
Re: Brno ZKK 600 9,3x62mm Project [Re: Rule303]
      #212787 - 16/07/12 02:23 AM

Looks very nice - same stock I put on my Daughter's .260 Rem. Your's looks MUCH better!! I need to do some slimming on her rifle - thanks for some ideas.

Some questions:
Is the barrel bedded in glass for 1/2" to a max of 1" ahead of the action?

Did you relieve the bedded from directly underneath, in front of and on each side of the recoil lug? Contact in any of these areas is normally not deemed to be good from an accuracy standpoint.

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


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

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TilleyMan
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Reged: 23/08/05
Posts: 272
Loc: Melbourne, Australia
Re: Brno ZKK 600 9,3x62mm Project [Re: DarylS]
      #212795 - 16/07/12 06:36 AM

Thanks for those kind words everyone... it was nice to be able to take the time to do the job properly.
I guess I was trying to keep the feel of the old stock with a 21st Century nod towards the Mauser Oberndorf Type A

Daryl... yes, the action is bedded for about 1" around the front screw and recoil lug and under the rear tang. Front and sides were relieved with tape but the bottom was left in contact... from my experience ZKK's seem to prefer it.

Then around 1" of contact just back from the fore-end, two thin pieces of cardboard were wedged under the barrel as the Devcon set to give a small amount of preload.

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DarylS
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Reged: 10/08/05
Posts: 27006
Loc: Beautiful British Columbia, Ca...
Re: Brno ZKK 600 9,3x62mm Project [Re: TilleyMan]
      #212862 - 17/07/12 01:26 AM

Sounds good, but now, due to the grouping, I'd try removing the forend tip pressure and see if that eliminates the vertical stringing. I know some guns like it (aparently), but something is causing the stringing - either the tip pressure or the bedding under the lug - perhaps.
Of course, load components, ie: primers and slightly high or low loading can also cause stringing. One merely eliminates the causes, one by one.

I completely floated my 7x57 M600 barrel ahead of the 1" chamber bedding and the .358 Norma and .375 BRNO's 602's behind and ahead of the front recoil lug (devcon bedded) and they all rewarded me with sub inch (mostly 1/2" or less for all) grouping at 100 yards(602's) and meters (7x57) off the bags. The really nice aspect about their grouping, was that a barrel running cold to too hot to handle had absolutely no effect on the grouping capabilities - on any of them.

With the .358 NM I actually beat a 6x47 BR Sporter group for group one afternoon in the 70's I was shooting 250gr. Speers and my largest 5 shot group was just over .250".

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


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

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TilleyMan
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Reged: 23/08/05
Posts: 272
Loc: Melbourne, Australia
Re: Brno ZKK 600 9,3x62mm Project [Re: DarylS]
      #212891 - 17/07/12 12:04 PM

Hi Daryl

That's astonishing accuracy from your .358NM!

There's a bit of a back story to my bedding decision...

I'm sure the fore-end bedding has some influence on the vertical stringing... my question is do any of your very accurate Brno ZKK's have the barrel band swivel?

I had no end of trouble bedding a ZKK601 .308 with integral barrel band sling swivel.

Orginally bedded as you recommend, with a fully floating barrel, it would change POI if carried even a short distance!

Barrel harmonics changed at the range if a sling was mounted or not.
The barrel would also visibly flex if the sling was looped over the left elbow as a brace when shooting offhand.

I never felt I could trust it completely... so it stayed in the safe.

I like a barrel mounted swivel as it enables a much lower profile when pushing through heavy tea-tree or dogwood scrub. My Sako AV 9.3x62 has a traditional stock mounted swivel which made the barrel about 5" higher so the front sight and hood were always catching on things overhead. Annoying.

So for this particular rifle, which will be carried a lot up and down some very rugged and remote hills and not fired a great deal, I'm willing to accept some vertical stringing so long as the first couple of shots out of a cold barrel are consistent.

Cheers

TM

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DarylS
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Reged: 10/08/05
Posts: 27006
Loc: Beautiful British Columbia, Ca...
Re: Brno ZKK 600 9,3x62mm Project [Re: TilleyMan]
      #212927 - 18/07/12 01:42 AM

I understand the situation.

The only rifle I had a barrel band swivel on, was my .458 2". That rifle's quite heavy, stubby 22" barrel didn't seem effected, but - I never shot it using the sling for support, only for carry.

When using a sling for support in shooting, I believe the sling should be attached to the forend and the barrel fully floated so as to not effect the barrel's direction nor harmonics. You must check to see that the forend does not bend over to touch the wood when the sling is tight.

It is surprising how little tension it takes to bend a barrel and thus throw shots.

I use a long enough loop on the sling so the muzzle, even of my 25" .275, sits at or below my head when I carry it. My right hand is on the sling (or stock if I am carrying it in front of me, to prevent the gun from moving or slapping me when walking.

The front carry is interesting, as the gun is then usually carried on the left side, with left hand on the forestock. If needed quickly, the hand is already where it needs to be to shoot the rifle. Simply place the right hand on the wrist as you rotate the rifle butt up onto your shoulder as the left hand aims the rifle and it is instantly aligned with your intended target s the butt comes into your shoulder.

I will switch to that method when in areas where game might be seen at any time - it allows a faster presentation than about any other carry, except for double handed. At least with only one hand, the left, on the forestock, your right is free for tree branch deflection.

True - the first 1 to 3 shots being accurate are the vital ones.
Best wishes

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


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

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