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Forum Index > Rifles general discussion > CZ550 bedding questions

CZ550 bedding questions

22 Apr 2016
@ 01:37 pm (GMT)

KWang

Hello everybody!
I am planning to bed my CZ550 rifle. The question I have is, should I blue tape the bottom of my recoil lug or not? Because it's different from a REM 700
that the front action screw goes into the bottom of the recoil lug.

Thanks

Replies

1
22 Apr 2016
@ 09:25 pm (GMT)

Nathan Foster

Re: CZ550 bedding questions
Hi Kai, please note that the bedding support here is for those who purchase our bedding kits.

The rules for your rifle are the same as others. You'll see the likes of the Howa in the bedding instructions which has a similar style lug.

The tape will help ensure that when the action is put in place, no crumbs or lube to cause the lug to sit high and ruin action contact elsewhere. This also helps the lug recoil back to battery.

You can if you wish to bed the underside of some large lug actions including both the Howa and older Sako rifles, however you will always run the above risks.

As I wrote in the Accurizing book, if you are pillar bedding, you may very well want that pillar to make contact with the lug. After all, why have a pillar otherwise. But having said this, a pillar can still be useful to simply stop stock splitting in its own right. And again it can still be useful to have this tiny gap under the recoil lug for reasons explained above. Those with bedding experience are painfully aware of just how pillar bedding can go wrong regardless of intentions. This is very hard to explain in one post. The trouble occurs when we set pillars in place, pour compound, then place the action down. The action is not able to make contact with the pillars because a shim of compound seeps between the pillar and action. But the shim is so weak that after bedding, it peels away, leaving the pillar counter sunk. The only way to prevent this is to attach the pillar to the action and then bed both the pillar and action together.

Again, these are topics discussed in the Accurizing book so if you wish to delve further, please look into this.

Some rifles have such a huge lug that you have no choice but to bed the underside. The Titan (your A-hole because this is going to hurt your wallet) is a good example of such an action.

If you have a barrel lug, you may need to bed this in the same manner as normal recoil lug but also bed a round section of the barrel at its location as centered battery point. Barrel lugs are a pain in the butt really. A good action bedding job is the key. Our epoxy will handle all of the big magnums, there is no need to absorb recoil at a barrel lug.
26 Apr 2016
@ 01:54 pm (GMT)

Kai Wang

Re: CZ550 bedding questions
Thanks Nathan for the kind response.
I am trying to order your book, practical guide to bolt action rifle accurizing and maintenance, ebook. Do you take credit card? I don't paypal.
26 Apr 2016
@ 02:00 pm (GMT)

Kai Wang

Re: CZ550 bedding questions
OK, just went through the payment with my CC.
26 Apr 2016
@ 06:57 pm (GMT)

Sebastian Shand

Re: CZ550 bedding questions
Gidday Kai
I've recently bedded my cz550 with a lot of help from nathan, I can put up photos if it's any use to you? The result was very good with my swede now shooting .3 inch groups consistently
26 Apr 2016
@ 09:03 pm (GMT)

Nathan Foster

Re: CZ550 bedding questions
Thanks Kai, hopefully the book gives you plenty of pointers. The bedding section is just one aspect, there is a heap of info you can put to use.

Thanks Sebastian, I am sure your photos would help Kai a great deal.
28 Apr 2016
@ 12:33 pm (GMT)

Kai Wang

Re: CZ550 bedding questions
Thanks a Million!
I am collecting any information about bedding CZ550 right now. There are not
many on web/youtube. If you could, please post here or email me at
[email protected]
One question I have after reading Nathan's book is at page 171, a picture
shows M70 action was taped. I can see the side of the magazine well was
red taped, the picture also show (not very clear) the front wall
(facing the recoil lug) was also red taped. But on the following page (172)
shows 3 basic type of action. The second one, similar to M70 and CZ550,
Nathan recommends red tap only the side of the magazine wall. Is there any
conflict here?

Thanks
Quote:
Gidday Kai
I've recently bedded my cz550 with a lot of help from nathan, I can put up photos if it's any use to you? The result was very good with my swede now shooting .3 inch groups consistently
28 Apr 2016
@ 08:53 pm (GMT)

Nathan Foster

Re: CZ550 bedding questions
OK, the diagram of the three action types is focused on the cross sectioned actions- studying the body of the action and not the lug. All we are concerned about here is the 3 general action types; round, square or a mix of round and square. The Mauser can be a mix of round and square- but the lower half is tapered on some, rather than having two vertical side walls. If the action tapers in this manner, you can bed it. You do not have to tape the bottom half of this action type as there is no risk of this area being a trapezium which would lock the action in place / trap points.

On your action, if you are full length bedding it, the mag well vertical walls do need to be taped.

As for the recoil lug of your rifle, the front bottom and sides need to be tape relieved.

One thing you have to be aware of on this rifle, is that the billet is generally rough, then hand polished to look fancy. One of the problems with this type of rifle is that it tricks end users. It looks at though it has been "machined" to perfection. Instead, what we have is some fancy end work to make it look swell which has no bearing on actual tolerances. In some cases, a polisher can stuff the tolerances through heavy buff work, such as on the top of the receiver (scope base alignment) or on any vertical sides including the tang. So you need to make sure that such an action has a good measure of relief so that it can return to battery while using any round surfaces including the start of the barrel to center the action.

Tangs should be inspected to see if they have some taper. It always pays to relieve the very rear of a vertical walled tang to prevent transferring recoil directly to the wrist of a stock. As for the sides of the tang, you can try to bed these but if after bedding the tang gets hung up, you need to scrape away some of the tang bedding or if the rifle is annoying you as they do me sometimes, actually change the angle of the tang metal so that nobody gets caught when doing future rebedding work after barrel changes or stock changes.

Your action is quite straight forwards Kai, it shares similarities with others and the processes are the same for all. You will be just fine.

Speaking of finishing (off topic sorry), I cut myself on another M77 the other day, did not see a burr at the front of the action. I normally spot them quick but this one was thinner than a shaving blade and I missed it momentarily, cut my thumb clean open as I handled the action. Healed quick though. Fun and games huh.
29 Apr 2016
@ 06:49 am (GMT)

Sebastian Shand

Re: CZ550 bedding questions

keep detailed photos of your trigger group, its got lots of random parts can be a bit fiddly.
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29 Apr 2016
@ 06:50 am (GMT)

Sebastian Shand

Re: CZ550 bedding questions
29 Apr 2016
@ 12:03 pm (GMT)

Kai Wang

Re: CZ550 bedding questions
Thanks Sabastian! These pictures help a lot! Our rifle stocks are exactly the
same. I have been scratching my head on the trigger removal. Don't see any
How-To on the web, nor can I find any video on youtube. I can see you
remove the screw that holds the original trigger in the rifle receiver. and then
push out the long pin that hold bolt stop and safety? I am very hesitant to do
this as I am afraid that there maybe some springs hiding behind that may
just fly to nowhere when I dissemble the trigger group. Do you have any
trigger removal instructions?

Thanks
29 Apr 2016
@ 02:36 pm (GMT)

Paul Leverman

Re: CZ550 bedding questions
Nice looking prep work, Sebastian.
29 Apr 2016
@ 07:51 pm (GMT)

Sebastian Shand

Re: CZ550 bedding questions
More photos to come, this is all I could load last night before my daughter demanded I read her stories for 3hours.

Thanks Paul this was my first bedding job and I spent hours staring at it each step stressing my poor heart out, thankfully Nathan calmed my nerves and with a lot of help from him I got there in the end!

I think I have more trigger group disassembly photos so I will load those up for you. The main thing that helped me was I took detailed photos of the trigger and each piece as I took it apart. Take great care as there is a lot of small parts and even a few miniature ball bearings just to make it a little more stressful haha.
I couldn't find any online instructions either but if you pull it apart slowly and lay the parts out how they come off and take photos it's not to bad.
Will get more photos up tonight



30 Apr 2016
@ 03:18 am (GMT)

Paul Leverman

Re: CZ550 bedding questions
Well, for a first one it looks way better than my tenth. I don't ever seem to get everything just right. Nothing serious, just make more work for myself. With the help you can get on this site, I'm sure Kai will do just fine.
30 Apr 2016
@ 07:56 pm (GMT)

Sebastian Shand

Re: CZ550 bedding questions

all snugged up for the night
came out with a gentle whack or two.
i think my mistake here was trying to bed to far forwards of the tang,

cleaned up and ready for action

5shot group
30 Apr 2016
@ 08:01 pm (GMT)

Sebastian Shand

Re: CZ550 bedding questions
also on the right hand side of the start of the barrel note i had some suck back so make sure you leave enough or you end up with a hollow in the bedding, not a major just looks abit average.
also the hole bottom left in group picture is not a bullet hole
30 Apr 2016
@ 08:06 pm (GMT)

Sebastian Shand

Re: CZ550 bedding questions
so with the trigger group just take out that front screw and then pop out all the pins and just lay it out the same way it would be in the action and take photos, its easier then it looks. i don't remember any springs flying out just try keep them separate as they are all different sizes. also there are some tiny ball bearings so watch out for those and were they come from

30 Apr 2016
@ 11:26 pm (GMT)

Kai Wang

Re: CZ550 bedding questions
Thanks a bunch Sebastian. I feel much better now. Just ordered
from ebay for two M6-0.75 screws. Can't find any in the local
hardware shop.
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