To do or not to do

Ahsan Ahmed

CGN Ultra frequent flyer
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I have a strong affinity for CZ550 rifles.

However, I’ve always had a love/hate relationship with one particular CZ550 (30-06). I have been using rifles for 45 years but never considered getting into reloading simply due to ease of availability of generally accurate factory ammo for the purposes of hunting.

The particular rifle was the catalyst that made me become involved in hand loading rifle cartridges. Prior to that all along, the frustration had been that the rifle (from a cold, clean and/or fouled barrel) always placed the first couple shots inside the bull at 100m and then the group opened up to about 5 inches! :)

That was regardless of testing with a variety of 150/165gr weights and ammo brands (all factory loads). I wasn’t bothered too much given that it was a plain hunting rifle anyway.

I also partially attributed that to the fact that the barrel although fully free floated isn’t centered in the stock channel but leans very close to the left side. It is apparent that a proper bedding job may be the appropriate thing to do.

I determined that the barrel responded quite favorably with a charge of 56.7gr of H4350 and integrity of 5-shot groups always remained intact – that had never ever been the case previously using factory loads!

Before the ranges had shut down here in ON, I made up a batch of some test loads with a mix of Sako/S&B brass, all other components remaining constant. The only noticeable change between the two groups were elevation shift. Well, a group is always easy to move. I didn't have any opportunity for further range session with this rifle.

Question is – how much would I really benefit from a bedding job given that I do not have the requisite skills to do one – which means spending $ to get the job done? The likelihood is that it might shoot even tighter groups and then again perhaps not … :)

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Have you ever checked the stock when the barrel is warm to see if it's in contact? Slide a five dollar bill down the barrel channel after a few shots?

might not be the issue, but when you said it's already close, it just might. You can widen the channel for little or no money, and if it doesn't work, you can still bed it.

I had an old friend, long gone now, that got one of his rifles to shoot by putting a piece of leather under the barrel at the forend tip to make a small pressure point. Barrel harmonics are funny things sometimes.
 
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I had a 550 in 6.5x55 that was like that first 2 shots perfect after that shots went right. Stock was just lightly touching the barrel. Sent it in to Wolverine (CZ warranty ) they put on a new stock sent it back it is amazingly accurate
 
A good bedding job has two benefits.

1) It improves accuracy (group size). This is why our target rifles are always bedded.

2) I helps maintain zero. This is not so important on a target rifle, because we get some practice shots before a match, but it is critical for a hunting rifle. The first shot is the one that matters.

It would be worthwhile to have your rifle bedded by someone who knows what they are doing.
 
Have you ever checked the stock when the barrel is warm to see if it's in contact? Slide a five dollar bill down the barrel channel after a few shots?

might not be the issue, but when you said it's already close, it just might. You can widen the channel for little or no money, and if it doesn't work, you can still bed it.

I had an old friend, long gone now, that got one of his rifles to shoot by putting a piece of leather under the barrel at the forend tip to make a small pressure point. Barrel harmonics are funny things sometimes.

Yes, the bill slides freely all the way. I've also considered relieving the apparently affected side of the stock albeit slightly once I am able to ID the high areas - that would be next step prior to going for the bedding ....
 
A good bedding job has two benefits.

1) It improves accuracy (group size). This is why our target rifles are always bedded.

2) I helps maintain zero. This is not so important on a target rifle, because we get some practice shots before a match, but it is critical for a hunting rifle. The first shot is the one that matters.

It would be worthwhile to have your rifle bedded by someone who knows what they are doing.

Absolutely! Presently, I have no experience with such task.
 
I love a happy ending. I had to remove some wood on my Zastava M70 because I had the same problem. After the barrel heated up it pushed against one side of the barrel channel, removing the excess wood relieved the problem.
Still thinking about glass bedding the action though.
 
I love a happy ending. I had to remove some wood on my Zastava M70 because I had the same problem. After the barrel heated up it pushed against one side of the barrel channel, removing the excess wood relieved the problem.
Still thinking about glass bedding the action though.
I had a tiger that did the same. Opened it up and sealed the wood afterwards and it made a huge difference.
 
I have a 1984 Ruger M77 - 7mm rem mag which I began to have great difficulty getting to shoot consistently. Kind of wrote myself off as to getting old ,bad eyesight and loosing my edge. Finally decided to free float the barrel as there was a slight contact point at the fore stock by the rifle sling lug .I also glass bedded the receiver at at the recoil lug at the same time. Overnight it changed into a different rifle....Where before I had the rifle" huntable " at moderate ranges 100 -150 yds maybe . It immediately grouped reasonably well at at 200+yds.[Need some load work and practice here ] In my younger hunting years I was comfortable with this rifle at 300+ yds .I still enjoy long range shooting but when it comes to hunting now I prefer to see the whites of their eyes so to speak....
 
Ok. I will bed it for you.

@ Ganderite

I wanted to take the opportunity to revive this thread to first express my deep sense of appreciation for taking the time to do the bedding job for me - again, thank you very much!

As you know, the rifle did a spiral deep dive afterwards with groups opening up regardless of various ladder tests with both H4350 and IMR 4350. Subsequently, I decided to eliminate one more variable i.e. validating seating depths (by .003") and bingo found what the rifle appears to like.

I feel it is good enough for a hunting rifle that never previously shot under 5in @ 100m. As I had previously mentioned, this particular rifle prompted me to get into reloading at a rather belated hour. :) Happy with the results overall. It was an excellent and highly enjoyable (and ongoing) learning curve for me.

Few images of my tests .....

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